WO2019114586A1

WO2019114586A1 - Information transmission method and device

Info

Publication number: WO2019114586A1
Application number: PCT/CN2018/119368
Authority: WO
Inventors: 周兴旺; 李峰; 王伟光
Original assignee: 华为技术有限公司
Priority date: 2017-12-11
Filing date: 2018-12-05
Publication date: 2019-06-20
Also published as: CN109905447A; CN109905447B

Abstract

The present application provides an information transmission method and a device. The method comprises: a first network apparatus sending a first byte stream to a second network apparatus, the first byte stream being a byte stream to be forwarded to a third network apparatus via the second network apparatus; the first network apparatus receiving first indication information and second indication information sent by the second network apparatus, the first indication information indicating that the second network apparatus has successfully received a first portion of the first byte stream, the second indication information indicating a second portion of the first byte stream, bytes included in the second portion being a portion of or all of the bytes included in the first portion, and the bytes included in the second portion being associated with bytes having been successfully received by the third network apparatus; and the first network apparatus deleting target bytes stored in a buffer according to the second indication information. The information transmission method and the device provided by the present application facilitate and ensure normal transmission of a byte stream.

Description

Method and device for information transmission

The present application claims priority to Chinese Patent Application No. PCT Application No. No. No. No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present application relates to the field of communications, and more particularly to a method and apparatus for information transmission in the field of communications.

Background technique

The transmission control protocol (TCP) is a connection-oriented, reliable, byte stream-based transport layer communication protocol. A TCP connection is established between the sender device and the receiver device, and the sender device uses a byte stream. The form sends the data to be transmitted to the receiving device.

In the data transmission process, the sending end device sends a byte stream to the receiving end device, and after receiving the byte included in the first part of the byte stream, the receiving end device sends an acknowledgement to the sending end device (acknowledgement). , ACK) message to confirm successful receipt of the first part. After receiving the ACK message, the sending end device deletes the byte included in the first part from the retransmission queue, and sends the byte included in the next part to the receiving end device, otherwise the transmitting end device will always try to retransmit. Until the receiving device acknowledges receipt of each byte in the byte stream.

In order to improve the performance of the data transmission, the byte stream is forwarded between the sender device and the receiver device through the proxy server, so that the TCP connection between the sender device and the receiver device is divided into the sender device and the A first TCP connection between the proxy servers and a second TCP connection between the proxy server and the sink device. Specifically, the sending end device sends the byte stream to the proxy server, the proxy server confirms the successfully received byte to the sending end device, and the proxy server forwards the byte stream to the receiving end device, and the receiving end The device acknowledges the successfully received byte to the proxy server.

However, since the sending end device only receives the ACK message sent by the proxy server, the proxy server deletes the successfully received byte by the ACK message from the retransmission queue, and thus may cause an error in subsequent forwarding. For example, packet loss, etc., affect the normal transmission of the byte stream.

Summary of the invention

The present application provides a method and apparatus for information transmission, which is beneficial for ensuring normal transmission of a byte stream.

In a first aspect, the application provides a method for information transmission, the method comprising:

Transmitting, by the first network device, a first byte stream to the second network device, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

The first network device receives the first indication information and the second indication information that are sent by the second network device, where the first indication information is used to indicate that the second network device successfully receives the first part of the first byte stream, where The second indication information is used to indicate a second part in the first byte stream, the second part includes a byte that is part or all of a byte included in the first part, and the second part includes a byte and a The byte successfully received by the third network device is associated;

The first network device deletes the target byte stored in the cache according to the second indication information.

The method for transmitting information according to the embodiment of the present application, the first network device determines, according to the first indication information, that the second network device successfully receives the first part, and deletes a target byte stored in the cache according to the second indication information, Since the byte included in the second part is associated with the byte successfully received by the third network device, it is advantageous to ensure normal transmission of the byte stream.

Optionally, before the first network device sends the first byte stream to the second network device, the first network device establishes a first communication connection with the second network device, and the second network device and the third network device Establish a second communication connection.

It should be understood that the first communication connection and the second communication connection are communication connections that support a reliable feedback mechanism, such as a TCP connection.

It should also be understood that when the first communication connection and the second communication connection are both TCP connections, the first byte stream can be understood as a TCP byte stream.

It should also be understood that the first network device transmits the data to be transmitted in the form of a byte stream, for example, the first byte stream may be a 10,000-byte video file, a 1000-byte audio file, or the like.

It should also be understood that the first network device may sequence the sequence number of each byte in the first byte stream according to the order in which the bytes included in the first byte stream are sent, and according to the sequence order of the sequence numbers. Each byte in the first byte stream is sequentially transmitted, for example, from small to large, wherein the sequence number of the first byte of the first byte stream is initialized to the first by the first network device The initial sequence number (ISN), the sequence number of the subsequent byte will be set by the first network device to the first ISN plus the offset of the byte in the first byte stream.

For example, the first byte stream includes 1000 bytes, the sequence number of the first byte in the first byte stream (ie, the initial sequence number) is 1, and the sequence number of the second byte is 2. The sequence number of the 1000th byte is 1000, and the first network device sequentially sends the first byte stream to the second network device according to the sequence number from 1 to 1000.

Optionally, the sequence number of the first byte of the first byte stream may also be initialized to other values by the first network device, for example, the first byte stream includes 1000 bytes, the first word The serial number of the first byte in the throttle (ie, the initial serial number) is 1500, the serial number of the second byte is 1501, ..., and the serial number of the 1000th byte is 2499.

It should be understood that the serial number of each byte in the first byte stream sent by the first network device illustrated herein is merely exemplary, and should not be construed as limiting the application.

It should also be understood that in the embodiment of the present application, a successfully received byte can be understood as a serial number consecutive byte received from the first byte of the first byte stream.

Optionally, the second indication information may explicitly indicate or implicitly indicate the byte included in the second part, and the indication manner is more flexible, which is not limited by the embodiment of the present application.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the second indication information includes information about a sequence number of a byte included in the second part.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the information about the sequence number of the byte included in the second part includes: The serial number of the byte; or the serial number of the first byte of the second part and the byte length of the second part; or the serial number of the first byte of the second part and the second part The serial number of the last byte.

In conjunction with the first or second possible implementation of the first aspect, in a third possible implementation of the first aspect, the second portion includes a byte that is the target byte.

Optionally, the second indication information includes a sequence number of the second byte, and the sequence number of the second byte is the same as the sequence number of the next byte of the second part.

Correspondingly, before the first network device deletes the target byte stored in the cache according to the second indication information, the method further includes: the first network device, the word whose sequence number is smaller than the sequence number of the second byte Section, determined as the target byte.

Optionally, the sequence number of the second byte may also be the same as the sequence number of the last byte of the second part.

Correspondingly, before the first network device deletes the target byte stored in the cache according to the second indication information, the method further includes: the first network device, the serial number is less than or equal to the serial number of the second byte The byte is determined as the target byte.

In conjunction with any one of the possible implementations of the first to third possible implementations of the first aspect, in a fourth possible implementation of the first aspect, the third network device successfully receives The byte is part or all of the bytes included in the second portion.

It should be understood that the byte included in the second part is associated with the byte successfully received by the third network device, and it can be understood that the byte successfully received by the third network device is part of the byte included in the second part or All. That is, the byte included in the second part is a byte that the first network device can delete.

Correspondingly, the target byte deleted by the first network device is the byte included in the second part.

In conjunction with the first aspect, in a fifth possible implementation manner of the first aspect, the second indication information includes a byte length of the second portion.

In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation manner of the first aspect, the first network device deletes the target byte stored in the cache according to the second indication information The method further includes: determining, by the first network device, the second part, the sequence number of the last byte of the second part, and the first part according to the first indication information and the byte length of the second part The last byte of the sequence number is the same; the first network device determines the byte of the byte included in the first part except the byte included in the second part as the target byte.

In conjunction with the fifth or sixth possible implementation of the first aspect, in a seventh possible implementation manner of the first aspect, the sequence number of the first byte of the second part is greater than the third The serial number of the last byte successfully received by the network device, the sequence number of the last byte of the second part being the same as the sequence number of the last byte of the first part.

It should be understood that the second part includes a byte associated with the byte successfully received by the third network device, and can also be understood that the sequence number of the first byte of the second part is greater than the third network device successfully receives. The serial number of the last byte of the second byte, and the sequence number of the last byte of the second part is the same as the sequence number of the last byte of the first part. That is to say, the byte included in the second part is a byte that the first network device cannot delete.

Correspondingly, the target byte deleted by the first network device is a byte of the byte included in the first part except the byte included in the second part.

In conjunction with any one of the possible implementations of the first to seventh possible implementations of the first aspect, in the eighth possible implementation of the first aspect, when the first byte stream is The method further includes: receiving, by the first network device, the third indication information that is sent by the fourth network device, where the third indication information includes the first a sequence number of the first byte, the sequence number of the first byte being greater than or equal to the sequence number of the first byte stored in the cache of the second network; the first network device according to the third indication information The fourth network device sends a third portion of the first byte stream, the sequence number of the first byte in the third portion being the same as the sequence number of the first byte.

When the third network device moves from the service range of the second network device to the service range of the fourth network device, switching from the second network device forwarding the first byte stream to the third network device to switch to the fourth The network device forwards the first byte stream for the third network device.

The method for transmitting information in the embodiment of the present application is beneficial to ensure normal transmission of the first byte stream in a scenario in which the second network device and the fourth network device are switched.

Optionally, before the first network device sends the first byte stream to the second network device, the first network device and the second network device may notify each other whether there is a way to perform various possible implementations of the first aspect. The first network device and the second network device together perform various possible implementations of the first aspect when the first network device and the second network device both have the capability.

With reference to any one of the possible implementations of the first to the eighth possible implementations of the first aspect, in the ninth possible implementation manner of the first aspect, the first indication information and the first Both indication information is carried in the acknowledgement ACK message.

With reference to any one of the first to the ninth possible implementation manners of the first aspect, in the tenth possible implementation manner of the first aspect, the first indication information is carried in the ACK In the message, the second indication information is carried in an in-band message or an out-of-band message.

With reference to any one of the first to the tenth possible implementation manners of the first aspect, in the eleventh possible implementation manner of the first aspect, the first byte stream is Transmission Control Protocol TCP byte stream.

In a second aspect, the application provides a method for information transmission, the method comprising:

The second network device determines to successfully receive the first part of the first byte stream sent by the first network device, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

The second network device sends first indication information to the first network device, where the first indication information is used to indicate that the first part is successfully received;

The second network device sends second indication information to the first network device, where the second indication information is used to indicate a second part in the first byte stream, and the second part includes a byte that is included in the first part Part or all of the bytes, and the bytes included in the second portion are associated with bytes successfully received by the third network device.

The method for transmitting information provided by the embodiment of the present application, the second network device determines to successfully receive the first part of the first byte stream sent by the first network device, and sends the first indication information and the second information to the first network device. Instructing the first network device to determine, according to the first indication information, that the second network device successfully receives the first part, and deleting the target byte stored in the cache according to the second indication information, thereby facilitating protection of the byte stream Normal transmission.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the second indication information includes information about a sequence number of a byte included in the second part.

With reference to the first possible implementation of the second aspect, in a second possible implementation manner of the second aspect, the information about the sequence number of the byte included in the second part includes: The serial number of the byte; or the serial number of the first byte of the second part and the byte length of the second part; or the serial number of the first byte of the second part and the second part The serial number of the last byte.

In conjunction with the first or second possible implementation of the second aspect, in a third possible implementation of the second aspect, the second portion includes a byte that is the target byte.

In conjunction with any one of the possible implementations of the first to third possible implementations of the second aspect, in a fourth possible implementation of the second aspect, the third network device successfully receives The byte is part or all of the bytes included in the second portion.

In conjunction with the second aspect, in a fifth possible implementation manner of the second aspect, the second indication information includes a byte length of the second portion.

With the fifth possible implementation of the second aspect, in a sixth possible implementation manner of the second aspect, the sequence number of the first byte of the second part is greater than the third network device successfully receiving The serial number of the last byte of the second byte, the sequence number of the last byte of the second part is the same as the sequence number of the last byte of the first part.

In conjunction with any one of the possible implementations of the first to sixth possible implementations of the second aspect, in the seventh possible implementation of the first aspect, when the first byte stream is The method further includes: sending, by the second network device, status information to the fourth network device, where the second network device forwards the packet to the second network device, where the second network device sends the status information to the fourth network device, where the status information includes the cache of the second network The serial number of the first byte stored in .

In conjunction with any one of the possible implementations of the first to seventh possible implementations of the second aspect, in the eighth possible implementation of the first aspect, the first indication information and the first Both indication information is carried in the acknowledgement ACK message.

With reference to any one of the first to the eighth possible implementation manners of the second aspect, in the ninth possible implementation manner of the first aspect, the first indication information is carried in the ACK In the message, the second indication information is carried in an in-band message or an out-of-band message.

With reference to any one of the first to the ninth possible implementation manners of the second aspect, in the tenth possible implementation manner of the first aspect, the first byte stream is a transmission Control protocol TCP byte stream.

In a third aspect, the application provides a method for information transmission, the method comprising:

The fourth network device receives the status information sent by the second network device, where the status information includes the sequence number of the first byte stored in the cache of the fourth network;

The fourth network device sends third indication information to the first network device according to the status information, where the third indication information includes a sequence number of the first byte, where the sequence number of the first byte is greater than or equal to the second A sequence number of a first byte stored in a cache of the network, wherein the first network device is switched by forwarding the byte in the first byte stream by the second network device to be forwarded by the fourth network device.

In conjunction with the third aspect, in a first possible implementation manner of the third aspect, the method further includes:

The fourth network device receives a third part of the first byte stream that is sent by the first network device according to the third indication information, a sequence number of the first byte in the third part, and the first word The serial numbers of the sections are the same.

In a fourth aspect, the present application provides an apparatus for transmitting information for performing the method of any of the above first aspect or any possible implementation of the first aspect.

In a fifth aspect, the present application provides an apparatus for transmitting information for performing the method of any of the foregoing second aspect or any of the possible implementations of the second aspect.

In a sixth aspect, the present application provides an apparatus for transmitting information for performing the method in any of the foregoing third aspect or any possible implementation of the third aspect.

In a seventh aspect, the present application provides an apparatus for information transmission, the apparatus comprising: a memory, a processor, a transceiver, and instructions stored on the memory and executable on the processor, wherein the memory, the processing And the communication interface communicate with each other through an internal connection path, wherein the processor executes the instructions to cause the apparatus to implement the method of any of the first aspect or the first aspect of the first aspect.

In an eighth aspect, the present application provides an apparatus for information transmission, the apparatus comprising: a memory, a processor, a transceiver, and instructions stored on the memory and executable on the processor, wherein the memory, the processing And the communication interface communicate with each other through an internal connection path, wherein the processor executes the instruction to cause the apparatus to implement the method of any of the second aspect or the second aspect of the second aspect.

In a ninth aspect, the present application provides an apparatus for information transmission, the apparatus comprising: a memory, a processor, a transceiver, and instructions stored on the memory and executable on the processor, wherein the memory, the processing And the communication interface communicate with each other through an internal connection path, wherein the processor executes the instruction to cause the apparatus to implement the method of any of the third aspect or the third aspect of the third aspect.

In a tenth aspect, the present application provides a computer readable medium for storing a computer program, the computer program comprising instructions for implementing the method of any of the first aspect or the first aspect of the first aspect.

In an eleventh aspect, the present application provides a computer readable medium for storing a computer program, the computer program comprising instructions for implementing the method of any of the second aspect or the second aspect of the second aspect.

In a twelfth aspect, the present application provides a computer readable medium for storing a computer program comprising instructions for implementing the method of any of the above-described third aspect or any of the possible implementations of the third aspect.

In a thirteenth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to implement the method of any of the first aspect or the first aspect of the first aspect.

In a fourteenth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to implement the method of any of the above-described second aspect or any of the possible implementations of the second aspect.

In a fifteenth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to implement the method of any of the above-described third or third aspect of the possible implementation.

In a sixteenth aspect, the present application provides a chip device, including: an input interface, an output interface, at least one processor, and a memory, wherein the input interface, the output interface, the processor, and the memory communicate with each other through an internal connection path. The processor is operative to execute code in the memory, and when the processor executes the code, the chip device implements the method of any of the first aspect or the first aspect of the first aspect.

In a seventeenth aspect, the present application provides a chip device, including: an input interface, an output interface, at least one processor, and a memory, wherein the input interface, the output interface, the processor, and the memory communicate with each other through an internal connection path. The processor is operative to execute code in the memory, and when the processor executes the code, the chip device implements the method of any of the second aspect or the second aspect of the second aspect.

In an eighteenth aspect, the present application provides a chip device, including: an input interface, an output interface, at least one processor, and a memory, wherein the input interface, the output interface, the processor, and the memory communicate with each other through an internal connection path. The processor is operative to execute code in the memory, the chip device implementing the method in any of the possible implementations of the third aspect or the third aspect described above when the processor executes the code.

DRAWINGS

1 is a schematic block diagram of an application scenario provided by an embodiment of the present application;

2 is a schematic block diagram of another application scenario provided by an embodiment of the present application;

3 is a schematic flowchart of a method for information transmission provided by an embodiment of the present application;

4 is a schematic diagram of transmission of a first byte stream according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of another method for information transmission provided by an embodiment of the present application;

6 is a schematic block diagram of an apparatus for information transmission provided by an embodiment of the present application;

FIG. 7 is a schematic block diagram of another apparatus for information transmission provided by an embodiment of the present application; FIG.

FIG. 8 is a schematic block diagram of another apparatus for information transmission provided by an embodiment of the present application; FIG.

FIG. 9 is a schematic block diagram of another apparatus for information transmission provided by an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, and a wideband code. Wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) System, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, wireless local area network (wireless local area) Network, WLAN) or the fifth generation of the fifth generation wireless communication system (the fifth generation, 5G).

1 is a schematic block diagram of an application scenario provided by an embodiment of the present application. As shown in FIG. 1, a first communication connection is established between a sender device and a proxy server, and the proxy server establishes a second communication connection with the receiver device. .

The sending end device is configured to generate data to be sent, and send the to-be-sent data to the proxy server in the form of a byte stream.

The proxy server is configured to receive the byte stream sent by the sender device, and forward the byte stream to the receiver device.

Optionally, the sender device may be, for example, a server, and the proxy server may be, for example, a base station, and the receiver device may be, for example, a client, and the server forwards a byte stream to the client through the base station.

It should be understood that the first communication connection and the second communication connection may be a communication connection supporting a reliable feedback mechanism, such as a TCP connection, that is, a byte stream transmitted through the first communication connection and the second communication connection may be Is a stream of TCP bytes.

For example, the first communication connection supports a reliable feedback mechanism, which can be understood as if the sending end device sends a first byte stream to the proxy server, and the proxy server determines to successfully receive the first part of the first byte stream, The sender device sends an ACK message, and the ACK message is used to confirm that the first part is successfully received. After receiving the ACK message, the sending end device deletes the byte included in the first part stored in the retransmission queue, and The next part of the byte is sent to the proxy server, otherwise the sender device will always try to retransmit until the receiving device confirms that each byte in the first byte stream is successfully received.

It should be understood that the source device may sequence the sequence number of each byte in the first byte stream according to the order in which the bytes included in the first byte stream are sent, and according to the sequence order of the sequence numbers, for example, a small to large sequence, in which each byte in the first byte stream is sequentially transmitted, wherein the sequence number of the first byte of the first byte stream is initialized by the source device to an initial sequence number value (initial Sequence number, ISN), the sequence number of the subsequent byte will be set by the sender device to the ISN plus the offset of the byte in the first byte stream.

It should also be understood that the first byte in the first byte stream is identical to the first byte of the first portion.

It should also be understood that a successfully received byte can be understood as a contiguous sequence of serial numbers received from the first byte of the first byte stream.

However, since the transmitting end device directly deletes the byte included in the first part stored in the retransmission queue after receiving the ACK message, as shown in FIG. 2, in the subsequent transmission process, when the The proxy server cannot continue to forward the first byte stream for the receiving device, and needs to switch to another proxy server to continue forwarding the first byte stream for the receiving device for the receiving device, which may result in the first A one-byte stream cannot continue to transmit normally, and may even cause the transmission of the first byte stream to fail.

Optionally, the scene in which the proxy server is down, or the scenario in which the proxy server needs to be switched due to the movement of the receiving device may cause the proxy server to continue forwarding the first for the receiving device. The byte stream is switched to continue forwarding by the target proxy server for the first byte stream for the sink device.

The method for transmitting information provided by the embodiment of the present application is beneficial for ensuring normal transmission of a byte stream.

FIG. 3 is a schematic flowchart of a method 300 for information transmission provided by an embodiment of the present application. The method 300 may be applied to an application scenario as described in FIG. 1 and/or FIG. 2.

S310. The first network device sends a first byte stream to the second network device, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device.

Optionally, the first network device may be the sending end device shown in FIG. 1 and FIG. 2, and the second network device may be the proxy server shown in FIG. 1 and FIG. 2, where the third network device may be The receiving end device shown in FIG. 1 and FIG. 2 is not limited in this embodiment of the present application.

Optionally, before S310, the first network device establishes a first communication connection with the second network device, and the second network device establishes a second communication connection with the third network device.

It should also be understood that the first network device may sequence the sequence number of each byte in the first byte stream according to the order in which the bytes included in the first byte stream are sent, and according to the sequence order of the sequence numbers. Each byte in the first byte stream is sequentially transmitted, for example, from small to large, wherein the sequence number of the first byte of the first byte stream is initialized to the first by the first network device The ISN, the sequence number of the subsequent byte, will in turn be set by the first network device to the first ISN plus the offset of the byte in the first byte stream.

For example, as shown in FIG. 4, the first byte stream includes 1000 bytes, and the sequence number of the first byte in the first byte stream (ie, the initial sequence number) is 1, the second byte. The sequence number is 2, ..., and the sequence number of the 1000th byte is 1000. The first network device sequentially transmits the first byte stream to the second network device according to the sequence number from 1 to 1000.

Optionally, the sequence number of the first byte of the first byte stream may also be initialized to other values by the first network device, for example, the first byte stream includes 1000 bytes, the first word The serial number of the first byte in the throttle (ie, the initial serial number) is 1500, the serial number of the second byte is 1501, ..., and the serial number of the 1000th byte is 2499, the first network device The first byte stream is transmitted to the second network device in sequence according to the sequence number from 1500 to 2499.

S320. The second network device determines to successfully receive the first part of the first byte stream sent by the first network device, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device.

It should be understood that in the embodiment of the present application, a successfully received byte can be understood as a serial number consecutive byte received from the first byte of the first byte stream.

For example, as shown in FIG. 4, the second network device receives the byte included in the first part, the first part includes 300 bytes, and the sequence number of the 300 bytes is from 1 to 300, that is, the first part The continuous 300 bytes are included, so the second network device can determine that the byte included in the first portion is successfully received.

It should also be understood that the first byte of the first portion of the first byte stream is identical to the first byte of the first byte stream.

Optionally, the second network device may also receive the byte of the sequence number 400 to the sequence number 500, but since the byte between the sequence number 400 and the sequence number 300 is not received, that is, the sequence number 300 to the sequence The numbers 400 are not continuous. Therefore, the bytes successfully received by the second network device are the bytes of the serial number 1 to the serial number 300.

S330, the second network device sends the first indication information to the first network device, where the first indication information is used to indicate that the first part is successfully received; correspondingly, the first network device receives the First indication information.

Optionally, the first indication information may be carried in an ACK message or other message, which is not limited by the embodiment of the present application.

As an optional embodiment, the first indication information may be an acknowledgment number in the ACK message, where the acknowledgment number is used to indicate that the second network device successfully receives the byte included in the first part.

Optionally, the first network device may consider that all bytes whose sequence number is smaller than the acknowledgement number in the ACK message are successfully received by the second network device.

For example, as shown in FIG. 4, when the second network device confirms that the byte of sequence number 1 to sequence number 300 is successfully received, an ACK message is sent to the first network device, and the acknowledgement number in the ACK message is 301, indicating The second network device successfully receives a byte having a sequence number less than 301.

In other words, the ACK message can also be understood as an implementation indicating that the second network device does not successfully receive the byte, or can be understood as an implementation of request retransmission for the lost byte, this application The embodiment does not limit this.

Optionally, the first network device may also consider that the byte whose sequence number is less than or equal to the acknowledgement number in the ACK message is successfully received by the second network device.

For example, as shown in FIG. 4, when the second network device confirms that the byte of sequence number 1 to sequence number 300 is successfully received, an ACK message is sent to the first network device, and the acknowledgement number in the ACK message is 300, indicating The second network device successfully receives a byte whose sequence number is less than or equal to 300.

It should be understood that the relationship between the acknowledgment number in the ACK message illustrated herein and the sequence number of the successfully received byte is merely exemplary and should not be construed as limiting the application.

Optionally, the first network device and the second network device may agree, by using a protocol, the relationship between the confirmation number and the serial number, or the first network device and the second network device may pre-negotiate the confirmation number and the sequence. The relationship of the number, or the second network device, may indicate the relationship between the confirmation number and the serial number by using the indication information, which is not limited by the embodiment of the present application.

Optionally, if the first indication information is an acknowledgment number in the ACK message, the first network device may perform a plurality of different operations after receiving the ACK message, which is not limited in this embodiment of the present application.

It should be understood that the operation that the first network device can perform after receiving the first indication information does not include deleting the cache, for example, storing the first part of the stored byte in the retransmission queue, for example, deleting the storage in the retransmission queue. The first part includes the bytes.

As an optional embodiment, the first network device may continue to send the byte in the byte stream to the second network device according to the first indication information.

As another optional embodiment, the first network device may wait for feedback of the second network device to receive the remaining bytes according to the first indication information.

S340, the second network device sends, to the first network device, second indication information, where the second indication information is used to indicate a second part in the first byte stream, where the second part includes a byte Part or all of the included bytes, and the second portion includes a byte associated with the byte successfully received by the third network device; correspondingly, the first network device receives the second network device Second indication information.

It should also be understood that the first byte of the second portion is identical to the first byte of the first portion.

S350. The first network device deletes the target byte stored in the cache according to the second indication information.

Optionally, the byte included in the second part is associated with the byte successfully received by the third network device, and it can be understood that the byte included in the second part is positively correlated with the byte successfully received by the third network device. Or, it can be understood that the byte included in the second part is negatively related to the byte successfully received by the third network device, which is not limited in this embodiment of the present application.

(1) Positive correlation:

The byte included in the second part is positively correlated with the byte successfully received by the third network device, and it can be understood that the byte successfully received by the third network device is part or all of the bytes included in the second part, That is, the byte included in the second part is a byte that the first network device can delete.

Correspondingly, in S350, the target byte deleted by the first network device is the byte included in the second part.

Optionally, the first network device and the second network device may pre-arrange that the byte included in the second part is positively related to the byte successfully received by the third network device, or the second network device may pass the first The second indication information indicates that the byte included in the second part is deleted, which is not limited in this embodiment of the present application.

As an alternative embodiment, the second portion includes bytes that are identical to the bytes successfully received by the third network device.

For example, as shown in FIG. 4, when the third network device successfully receives the bytes of sequence number 1 to sequence number 149, the second portion may include the bytes of sequence number 1 to sequence number 149.

As another optional embodiment, the second portion includes a byte including an additional at least one byte in addition to the byte successfully received by the third network device.

Optionally, the additional at least one byte may be at least one byte that is consecutive to the byte successfully received by the third network device, where the at least one byte may be, for example, that the second network device has been to the third network. The device sends, but has not received the acknowledgment byte of the third network device, or the second network device predicts the byte that can be successfully received by the third network device, which is not limited in this embodiment of the present application.

For example, as shown in FIG. 4, when the third network device successfully receives the bytes of sequence number 1 to sequence number 149, the second portion may include the bytes of sequence number 1 to sequence number 160.

Optionally, the second indication information may explicitly indicate the byte included in the second part, or the second indication information may implicitly indicate the byte included in the second part, which is not limited by the embodiment of the present application.

Explicit indication mode: the second indication information includes information about bytes included in the second part.

Optionally, the information about the sequence number of the byte included in the second part includes: a sequence number of each byte of the second part; or a sequence number of the first byte of the second part and the second part The length of the part of the byte; or the sequence number of the first byte of the second part and the sequence number of the last byte of the second part.

Correspondingly, the first network device may determine a sequence number of each byte in the second part according to the second indication information.

For example, as shown in FIG. 4, when the second part includes the bytes of the sequence number 1 to the sequence number 160, the second indication information may include the sequence number 1 to the sequence number 160; or the second indication information may include The serial number 1 and the byte length 160; or the second indication information may include the serial number 1 and the serial number 160.

Implicit indication mode: the second indication information includes a sequence number of the second byte, and the sequence number of the second byte is the same as the sequence number of the next byte of the second part.

Correspondingly, the first network device may determine a byte whose sequence number is smaller than the sequence number of the second byte as the target byte.

For example, as shown in FIG. 4, when the second part includes the byte of the sequence number 1 to the sequence number 160, the second indication information may include the sequence number 161, and the first network device shall have a sequence number less than 161 bytes. Determined as the target byte.

Optionally, the second indication information may further include a sequence number of the last byte of the second part.

Correspondingly, the first network device can determine the byte of the sequence number whose sequence number is less than or equal to the last byte of the second part as the target byte.

For example, as shown in FIG. 4, when the second part includes the byte of the serial number 1 to the serial number 160, the second indication information may include the serial number 160, and the first network device sets the serial number to be less than or equal to 160. The byte is determined as the target byte.

It should be understood that the relationship between the serial number included in the second indication information and the serial number included in the second portion is only exemplary, and should not be construed as limiting the application.

(2) Negative correlation:

The byte included in the second part is negatively correlated with the byte successfully received by the third network device, and it can be understood that the sequence number of the first byte of the second part is greater than the last word successfully received by the third network device. The serial number of the section, the sequence number of the last byte of the second part is the same as the sequence number of the last byte of the first part, that is, the byte included in the second part is a word that the first network device cannot delete. Section.

Correspondingly, in S350, the target byte deleted by the first network device is a byte of the byte included in the first part except the byte included in the second part.

Optionally, the first network device and the second network device may pre-arrange that the byte included in the second part is negatively related to the byte successfully received by the third network device, or the second network device may pass the first The second indication information indicates that the byte other than the byte included in the second part is deleted, which is not limited in this embodiment of the present application.

Correspondingly, the first network device may determine, according to the second indication information, a sequence number of each byte included in the second part, and divide the word included in the first part by the word included in the second part. The bytes outside the section are determined as the target bytes.

For example, as shown in FIG. 4, when the second part includes the byte of the serial number 161 to the serial number 300, the second indication information may include the serial number 161 to the serial number 300; or the second indication information may include The serial number 161 and the byte length 140; or the second indication information may include the serial number 161 and the serial number 300.

Accordingly, the first network device can determine the byte of sequence number 1 to sequence number 160 as the target byte.

Implicit indication mode: the second indication information includes the byte length of the second part.

Correspondingly, the first network device determines, according to the first indication information and a byte length of the second part, the second part, the sequence number of the last byte of the second part and the last word of the first part The sequence number of the section is the same; the first network device determines the byte of the byte included in the first part except the byte included in the second part as the target byte.

For example, as shown in FIG. 4, when the second part includes the byte of the sequence number 161 to the sequence number 300, the second indication information may include a byte length of 140; the first network device divides the sequence in the first part. A byte other than 140 bytes before the number 300 is determined as the target byte.

Optionally, the first network device deletes the target byte stored in the cache according to the second indication information, and the first network device only deletes the target byte stored in the retransmission queue, but the The target byte is still stored in the local disk or the hard disk of the first network device, so as to send the first byte stream to other receiving devices.

Optionally, before the S350, the second network device may send, to the third network device, a byte in the first byte stream that is successfully received by the second network device.

It should also be understood that the second network device may sequence the sequence number of each byte in the first byte stream according to the order in which the bytes included in the first byte stream are sent, and according to the sequence order of the sequence numbers. Each byte in the first byte stream is sequentially transmitted, for example, from small to large, wherein the sequence number of the first byte of the first byte stream is initialized to the second by the second network device The ISN, the sequence number of the subsequent byte, will in turn be set by the second network device to the second ISN plus the offset of the byte in the first byte stream.

For example, as shown in FIG. 4, the second network device successfully receives a byte included in the first portion of the first byte stream, the first portion including 300 bytes, and the first byte in the first portion The serial number (ie, the initial serial number) is 1, the second byte has a serial number of 2, ..., and the serial number of the 300th byte is 300, and the second network device sequentially follows the sequence number from 1 to 300. The byte included in the first portion is transmitted to the third network device.

Optionally, the sequence number of the first byte of the first part may also be initialized to other values by the second network device, for example, the second network device successfully receives the first part of the first byte stream. Byte, the first part includes 300 bytes, the serial number of the first byte in the first part (ie, the initial serial number) is 321, the serial number of the second byte is 322, ..., the 300th The sequence number of the byte is 621, and the second network device sequentially sends the byte included in the first part to the third network device according to the sequence number from 1 to 300.

It should be understood that the serial number of each byte in the first portion sent by the second network device illustrated herein is merely exemplary and should not be construed as limiting the application.

Optionally, the first SNI determined when the first byte stream is sent by the first network device and the second SNI determined when the second network device forwards the first byte stream may be the same or different. The application embodiment does not limit this.

Optionally, the manner in which the second network device confirms the byte received by the third network device is the same as the manner in which the first network device determines that the second network device receives the byte included in the first part, to avoid repetition. , will not repeat them here.

Optionally, the second network device, after confirming the byte successfully received by the third network device, may delete the byte successfully received by the third network device stored in the cache.

Optionally, the second indication information may be carried in an ACK message, such as an option field of an ACK message, or the second indication information may be carried in an in-band message, an out-of-band message, or other message. This example does not limit this.

Optionally, before S310, the first network device and the second network device may negotiate a buffer capacity value that can be supported.

Specifically, the second network device sends the first cache information to the first network device, where the first cache information includes a first cache capacity value supported by the second network device; the first network device sends the first network device to the second network The device sends the second cache information, where the second cache information includes a second cache capacity value supported by the first network device, where the first network device and the second network device compare the first cache capacity value and the second cache The minimum value of the capacity values is configured as its own cache capacity value.

For example, if the first network device supports a cache capacity of 1000 bytes and the second network device supports a cache capacity of 500 bytes, both the first network device and the second network device configure their own cache capacity. It is 500 bytes.

Optionally, the first network device and the second network device may negotiate a buffer capacity value that can be supported during the handshake phase, for example, the first cache information and the second cache information may be carried in the synchronization message.

Optionally, before S310, the first network device and the second network device may notify each other whether the capability of performing S310-S350 is performed. When the first network device and the second network device both have the capability, the The first network device and the second network device jointly perform S310 to S350.

As an optional embodiment, the first network device and the second network device may mutually notify whether the capability is supported during the handshake phase.

Optionally, if the sender device shown in FIG. 1 and FIG. 2 does not have the capability of performing S310-S350, the first network device may be a proxy server of the sender device supporting the capability, and the sender terminal The proxy server may for example be a packet data network (PDN) gateway (PGW).

It should be understood that, in the scenario shown in FIG. 2, it is assumed that the proxy server successfully receives the first part of the first byte stream sent by the sending end device, and forwards the byte included in the first part to the receiving end device, When the receiving end device successfully receives a partial byte in the byte included in the first part, sending an ACK message to the proxy server for confirming successful reception of the partial byte, after receiving the ACK message, the receiving end device receives the ACK message. The partial bytes stored in the retransmission queue are deleted, and the remaining bytes of the bytes included in the first part except the partial bytes are further forwarded.

However, before the proxy server forwards the remaining bytes to the receiving device, a handover as shown in FIG. 2 occurs, due to bandwidth and/or switching time limitations between the proxy server and the target proxy server, The remaining bytes stored in the proxy server cache cannot be switched to the target proxy server, and the sender device has also deleted the bytes included in the first portion, so that the remaining bytes cannot be transmitted to the sink device, thereby Affecting the normal transmission of the first byte stream.

At this time, it is necessary to provide a solution to solve the problem of how to ensure the normal transmission of the first byte stream in the scenario where the proxy server and the target proxy server switch.

FIG. 5 illustrates a method 500 for information transmission, which is applied to an application scenario as shown in FIG. 2 .

S510, the second network device sends status information to the fourth network device, where the status information includes a sequence number of a first byte stored in a cache of the second network; correspondingly, the fourth network device receives the The status information sent by the second network device.

Optionally, the second network device may be the proxy server described in FIG. 2, and the fourth network device may be the target proxy server described in FIG. 2.

It should be understood that prior to S510, the second network device has deleted the stored bytes successfully received by the third network device.

For example, as shown in FIG. 4, the second network device successfully receives the bytes included in the first part, that is, the bytes of the serial number 1 to the serial number 300, sent by the first network device, and the third network device successfully receives the data. a byte of serial number 1 to serial number 149 forwarded by the second network device, at this time, the second network device deletes a byte of serial number 1 to serial number 149 stored in the cache, that is, the second network device When the byte number of the serial number 150 to the serial number 300 is stored in the buffer, the status information includes the serial number 150.

S520, the fourth network device sends third indication information to the first network device according to the status information, where the third indication information includes a sequence number of the first byte, where the sequence number of the first byte is greater than or equal to the The sequence number of the first byte stored in the cache of the second network; correspondingly, the first network device receives the third indication information sent by the fourth network device.

Optionally, before S520, the fourth network device determines the sequence number of the first byte according to the state information.

The second network device may transfer a part of the byte storage stored in the cache to the fourth network device by using the X2 interface or the communication connection state information during the switching process of the second network device and the fourth network device; or The second network device may send the partial byte to the third network device, but has not received the acknowledgement of the third network device, therefore, the sequence number of the first byte may be greater than or equal to the second network. The serial number of the first byte stored in the device's cache.

For example, as shown in FIG. 4, when the byte of the sequence number 150 to the serial number 300 is stored in the cache of the second network device, the sequence number of the first byte may be 150, or the sequence number of the first byte. Can be greater than 150.

Optionally, the communication connection status information may include status information of the first communication connection (ie, a communication connection between the first network device and the second network device) and the second communication connection (ie, the second network device) Status information of the communication connection with the third network device.

For example, the status information of the first communication connection may include a source internet protocol (IP) address, a source port number, a target IP address, a target port number, and a protocol type of the first communication connection; The status information may include a source IP address, a source port number, a destination IP address, a destination port number, and a protocol type of the second communication connection.

Optionally, the communication connection status information may further include status information of the second network device.

For example, the status information of the second network device includes a sequence number of the first byte and a sequence number of the last byte successfully received by the second network device, and the second network device sends the third network device to the third network device. The serial number of the first byte and the serial number of the last byte.

S530. The first network device sends, according to the third indication information, a third part in the first byte stream to the fourth network device, where the sequence number of the first byte in the third part is The one-byte serial number is the same.

Correspondingly, the fourth network device receives the third part of the first byte stream that is sent by the first network device according to the third indication information, and the sequence number of the first byte in the third part is The first byte has the same serial number.

In this way, the fourth network device completes the handover and handover with the second network device, and the fourth network device continues to forward the word included in the third portion sent by the first network device to the third network device. The section and the bytes included in other parts of the first byte stream.

The method for transmitting information provided by the embodiment of the present application can ensure normal transmission of the first byte stream in the scenario in which the second network device and the fourth network device are switched.

The information transmission method provided by the embodiment of the present application is described in detail with reference to FIG. 1 to FIG. 5 . The apparatus for information transmission provided by the embodiment of the present application will be described below with reference to FIG. 6 to FIG.

FIG. 6 is a schematic block diagram of an apparatus 600 for information transmission provided by an embodiment of the present application. The device 600 includes:

The sending unit 610 is configured to send, to the second network device, a first byte stream, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

The receiving unit 620 is configured to receive the first indication information and the second indication information that are sent by the second network device, where the first indication information is used to indicate that the second network device successfully receives the first part of the first byte stream, The second indication information is used to indicate a second part in the first byte stream, the second part includes a byte that is part or all of a byte included in the first part, and the second part includes a byte Associated with a byte successfully received by the third network device;

The processing unit 630 is configured to delete the target byte stored in the cache according to the second indication information received by the receiving unit 620.

Optionally, the second indication information includes information about a sequence number of a byte included in the second part.

Optionally, the second part includes a byte that is the target byte.

Optionally, the byte successfully received by the third network device is part or all of the bytes included in the second part.

Optionally, the second indication information includes a byte length of the second part.

Optionally, the processing unit is further configured to: before the deleting the target byte stored in the cache according to the second indication information, determining the second according to the first indication information and a byte length of the second part Part, the sequence number of the last byte of the second part is the same as the sequence number of the last byte of the first part; the byte included in the first part except the byte included in the second part , determined as the target byte.

Optionally, the sequence number of the first byte of the second part is greater than the sequence number of the last byte successfully received by the third network device, and the sequence number of the last byte of the second part is related to the first part The last byte of the sequence number is the same.

Optionally, the receiving unit is further configured to: when the first byte stream is forwarded by the second network device, to be forwarded by the fourth network device, receive the third indication information sent by the fourth network device, where the The third indication information includes a sequence number of the first byte, where the sequence number of the first byte is greater than or equal to the sequence number of the first byte stored in the cache of the second network; the sending unit is further configured to The third indication information is sent to the fourth network device, the third part of the first byte stream, the sequence number of the first byte in the third part is the same as the sequence number of the first byte.

Optionally, the first indication information and the second indication information are both carried in the acknowledgement ACK message.

Optionally, the first indication information is carried in an ACK message, and the second indication information is carried in an inband message or an outband message.

Optionally, the first byte stream is a Transmission Control Protocol TCP byte stream.

It should be understood that the apparatus 600 herein is embodied in the form of a functional unit. The term "unit" as used herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (eg, a shared processor, a proprietary processor, or a group) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and/or other suitable components that support the described functionality. In an alternative example, those skilled in the art may understand that the device 600 may be specifically the first network device in the foregoing method 300 and method 500, and the device 600 may be used to perform the foregoing method 300 and method 500 in the embodiment. The various processes and/or steps corresponding to the first network device are not repeated here to avoid repetition.

FIG. 7 is a schematic block diagram of an apparatus 700 for information transmission provided by an embodiment of the present application. The device 700 includes:

The processing unit 710 is configured to determine to successfully receive the first part of the first byte stream sent by the first network device, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

The sending unit 720 is configured to send the first indication information to the first network device, where the first indication information is used to indicate that the processing unit 710 determines to successfully receive the first part;

The sending unit 720 is further configured to send, to the first network device, second indication information, where the second indication information is used to indicate a second part in the first byte stream, where the second part includes a byte A portion of or all of the included bytes, and the bytes included in the second portion are associated with bytes successfully received by the third network device.

Optionally, the second part includes a byte that is the target byte.

Optionally, the sending unit is further configured to: when the first byte stream is forwarded by the second network device to be forwarded by the fourth network device, send status information to the fourth network device, where the status information includes The serial number of the first byte stored in the cache of the second network.

It should be understood that the apparatus 700 herein is embodied in the form of a functional unit. The term "unit" herein may refer to an ASIC, an electronic circuit, a processor (eg, a shared processor, a proprietary processor, or a group processor, etc.) and memory, a merge logic, and a processor for executing one or more software or firmware programs. / or other suitable components that support the described functionality. In an alternative example, those skilled in the art may understand that the device 700 may be specifically the second network device in the foregoing method 300 and the method 500. The device 700 may be used to perform the foregoing method 300 and method 500. The various processes and/or steps corresponding to the second network device are not repeated here to avoid repetition.

FIG. 8 shows an apparatus 800 for data transmission provided by an embodiment of the present application. The apparatus 800 may be the first network device described in FIG. 3 and FIG. 5, and the apparatus 800 may adopt a hardware architecture as shown in FIG. 8. The apparatus can include a processor 810, a transceiver 820, and a memory 830 that communicate with one another via internal connection paths. The related functions implemented by the processing unit 630 in FIG. 6 may be implemented by the processor 810, and the related functions implemented by the transmitting unit 710 and the receiving unit 720 may be implemented by the processor 810 controlling the transceiver 820.

The processor 810 may include one or more processors, for example, including one or more central processing units (CPUs). In the case where the processor is a CPU, the CPU may be a single core CPU, and It can be a multi-core CPU.

The transceiver 820 is configured to transmit and receive data and/or signals, as well as to receive data and/or signals. The transceiver can include a transmitter and a receiver for transmitting data and/or signals, and a receiver for receiving data and/or signals.

The memory 830 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read only memory (EPROM), and a read only memory. A compact disc read-only memory (CD-ROM) for storing related instructions and data.

The memory 830 is used to store the program code and data of the device, and may be a separate device or integrated in the processor 810.

Specifically, the processor 810 is configured to control the transceiver to perform information transmission with the second network device and/or the fourth network device. For details, refer to the description in the method embodiment, and details are not described herein again.

It will be appreciated that Figure 8 only shows a simplified design of the device. In practical applications, the device may also include other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all devices that can implement the present application are within the scope of the present application. Inside.

In one possible design, device 800 can be replaced with a chip device, such as a communication chip that can be used in the device for implementing the relevant functions of processor 810 in the device. The chip device can be a field programmable gate array for implementing related functions, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, or a programmable controller or other integrated chip. . Optionally, the chip may include one or more memories for storing program code that, when executed, causes the processor to perform the corresponding functions.

FIG. 9 shows an apparatus 900 provided by an embodiment of the present application. The apparatus 900 may be the second network device described in FIG. 3 and FIG. 5, and the apparatus 900 may adopt a hardware architecture as shown in FIG. 9. The apparatus can include a processor 910, a transceiver 920, and a memory 930, the processor 910, the transceiver 920, and the memory 930 communicating with one another via internal connection paths. The related functions implemented by the processing unit 710 in FIG. 7 may be implemented by the processor 910, and the related functions implemented by the transmitting unit 720 may be implemented by the processor 910 controlling the transceiver 920.

The processor 910 may include one or more processors, for example, including one or more CPUs. In the case where the processor is a CPU, the CPU may be a single core CPU or a multi-core CPU.

The transceiver 920 is configured to transmit and receive data and/or signals, as well as to receive data and/or signals. The transceiver can include a transmitter and a receiver for transmitting data and/or signals, and a receiver for receiving data and/or signals.

The memory 930 includes, but is not limited to, a RAM, a ROM, an EPROM, a CD-ROM, and the memory 930 is used to store related instructions and data.

The memory 930 is used to store the program code and data of the device, and may be a separate device or integrated in the processor 910.

Specifically, the processor 910 is configured to control, by the transceiver, information transmission with the first network device and/or the fourth network device. For details, refer to the description in the method embodiment, and details are not described herein again.

It will be appreciated that Figure 9 only shows a simplified design of the device. In practical applications, the device may also include other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all devices that can implement the present application are within the scope of the present application. Inside.

In one possible design, device 900 can be replaced with a chip device, such as a communication chip that can be used in the device for implementing the relevant functions of processor 910 in the device. The chip device can be a field programmable gate array for implementing related functions, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, or a programmable controller or other integrated chip. . Optionally, the chip may include one or more memories for storing program code that, when executed, causes the processor to perform the corresponding functions.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A method for transmitting information, comprising:

Transmitting, by the first network device, a first byte stream to the second network device, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

The first network device receives the first indication information and the second indication information that are sent by the second network device, where the first indication information is used to indicate that the second network device successfully receives the first byte stream. a first part, the second indication information is used to indicate a second part of the first byte stream, and the second part includes a byte that is part or all of a byte included in the first part, and The second portion includes a byte associated with a byte successfully received by the third network device;

The first network device deletes the target byte stored in the cache according to the second indication information.
The method according to claim 1, wherein said second indication information includes information of a sequence number of a byte included in said second portion.
The method according to claim 2, wherein the information of the serial number of the bytes included in the second portion comprises:

a serial number of each byte of the second portion; or

a sequence number of a first byte of the second portion and a byte length of the second portion; or

a sequence number of a first byte of the second portion and a sequence number of a last byte of the second portion.
The method according to claim 2 or 3, wherein the byte included in the second portion is the target byte.
The method according to any one of claims 2 to 4, wherein the byte successfully received by the third network device is part or all of the bytes included in the second part.
The method according to claim 1, wherein the second indication information includes a byte length of the second portion.
The method according to claim 6, wherein before the deleting, by the first network device, the target byte stored in the cache according to the second indication information, the method further includes:

Determining, by the first network device, the second part, a sequence number of a last byte of the second part, and a first part of the first part according to the first indication information and a byte length of the second part The last byte has the same serial number;

The first network device determines, in the byte included in the first part, a byte other than the byte included in the second part as the target byte.
The method according to claim 6 or 7, wherein the sequence number of the first byte of the second portion is greater than the sequence number of the last byte successfully received by the third network device, The sequence number of the last byte of the two parts is the same as the sequence number of the last byte of the first part.
The method according to any one of claims 1 to 8, wherein when the first byte stream is switched by forwarding by the second network device to be forwarded by the fourth network device, the method further include:

Receiving, by the first network device, the third indication information that is sent by the fourth network device, where the third indication information includes a sequence number of the first byte, where the sequence number of the first byte is greater than or equal to the a serial number of the first byte stored in the cache of the second network device;

Transmitting, by the first network device, the third part in the first byte stream to the fourth network device according to the third indication information, and the sequence number of the first byte in the third part The same as the serial number of the first byte.
The method according to any one of claims 1 to 9, wherein the first indication information and the second indication information are both carried in an acknowledgement ACK message.
The method according to any one of claims 1 to 10, wherein the first indication information is carried in an ACK message, and the second indication information is carried in an in-band message or an out-of-band message.
The method according to any one of claims 1 to 11, wherein the first byte stream is a Transmission Control Protocol TCP byte stream.
A method for transmitting information, comprising:

Determining, by the second network device, that the first part of the first byte stream sent by the first network device is successfully received, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

The second network device sends first indication information to the first network device, where the first indication information is used to indicate that the first part is successfully received;

The second network device sends second indication information to the first network device, where the second indication information is used to indicate a second part in the first byte stream, and the second part includes a byte And being part or all of the bytes included in the first portion, and the bytes included in the second portion are associated with bytes successfully received by the third network device.
The method according to claim 12, wherein when the first byte stream is forwarded by the second network device to be forwarded by the fourth network device, the method further includes:

The second network device sends status information to the fourth network device, where the status information includes a sequence number of a first byte stored in a cache of the second network device.
The method according to claim 13 or 14, wherein said first byte stream is a Transmission Control Protocol TCP byte stream.
An apparatus for information transmission, comprising:

a sending unit, configured to send, to the second network device, a first byte stream, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

a receiving unit, configured to receive the first indication information and the second indication information that are sent by the second network device, where the first indication information is used to indicate that the second network device successfully receives the first byte stream a first part, the second indication information is used to indicate a second part in the first byte stream, and the second part includes a byte that is part or all of a byte included in the first part, and Included in the second portion is a byte associated with a byte successfully received by the third network device;

And a processing unit, configured to delete the target byte stored in the cache according to the second indication information received by the receiving unit.
The apparatus according to claim 16, wherein said second indication information includes information of a sequence number of a byte included in said second portion.
The apparatus according to claim 17, wherein the information of the serial number of the bytes included in the second part comprises:

a serial number of each byte of the second portion; or

a sequence number of a first byte of the second portion and a byte length of the second portion; or

a sequence number of a first byte of the second portion and a sequence number of a last byte of the second portion.
The apparatus according to claim 17 or 18, wherein said second portion comprises a byte of said target byte.
The apparatus according to any one of claims 17 to 19, wherein the byte successfully received by the third network device is part or all of a byte included in the second part.
The apparatus according to claim 16, wherein said second indication information includes a byte length of said second portion.
The device according to claim 21, wherein the processing unit is further configured to:

Determining, according to the first indication information and a byte length of the second part, the second part, the second part, before deleting the target byte stored in the cache according to the second indication information The sequence number of the last byte of the part is the same as the sequence number of the last byte of the first part;

A byte other than the byte included in the second portion included in the first portion is determined as the target byte.
The apparatus according to claim 21 or 22, wherein the sequence number of the first byte of the second portion is greater than the sequence number of the last byte successfully received by the third network device, The sequence number of the last byte of the two parts is the same as the sequence number of the last byte of the first part.
Apparatus according to any one of claims 16 to 23, wherein

The receiving unit is further configured to: when the first byte stream is forwarded by the second network device to be forwarded by the fourth network device, receive the third indication information sent by the fourth network device, The third indication information includes a sequence number of the first byte, where the sequence number of the first byte is greater than or equal to the sequence number of the first byte stored in the cache of the second network device;

The sending unit is further configured to send, according to the third indication information, a third part in the first byte stream to the fourth network device, and a sequence of a first byte in the third part The number is the same as the serial number of the first byte.
The apparatus according to any one of claims 16 to 24, wherein the first indication information and the second indication information are both carried in an acknowledgement ACK message.
The apparatus according to any one of claims 16 to 25, wherein the first indication information is carried in an ACK message, and the second indication information is carried in an in-band message or an out-of-band message.
The apparatus according to any one of claims 16 to 26, wherein the first byte stream is a Transmission Control Protocol TCP byte stream.
An apparatus for information transmission, comprising:

a processing unit, configured to determine to successfully receive a first part of the first byte stream sent by the first network device, where the first byte stream is a byte stream that is forwarded by the second network device to the third network device;

a sending unit, configured to send the first indication information to the first network device, where the first indication information is used to indicate that the processing unit determines to successfully receive the first part;

The sending unit is further configured to send, to the first network device, second indication information, where the second indication information is used to indicate a second part in the first byte stream, and the second part includes a word The section is part or all of the bytes included in the first portion, and the bytes included in the second portion are associated with bytes successfully received by the third network device.
The apparatus according to claim 28, wherein the sending unit is further configured to: when the first byte stream is switched by forwarding by the second network device to be forwarded by the fourth network device, The fourth network device sends status information, where the status information includes a sequence number of the first byte stored in the cache of the second network.
The apparatus according to claim 28 or 29, wherein said first byte stream is a Transmission Control Protocol TCP byte stream.
An apparatus for information transmission, the apparatus comprising a memory, a processor, a communication interface, and instructions stored on the memory and executable on the processor, wherein the memory, the processor, and the The communication interfaces communicate with one another via internal connection paths, characterized in that the processor executes the instructions such that the apparatus implements the method of any of the preceding claims 1 to 12.
An apparatus for information transmission, the apparatus comprising a memory, a processor, a communication interface, and instructions stored on the memory and executable on the processor, wherein the memory, the processor, and the The communication interfaces communicate with one another via internal connection paths, characterized in that the processor executes the instructions such that the apparatus implements the method of any of the preceding claims 13 to 15.
A computer readable medium for storing a computer program, characterized in that the computer program comprises instructions for implementing the method of any of the preceding claims 1 to 12.
A computer readable medium for storing a computer program, characterized in that the computer program comprises instructions for implementing the method of any of the preceding claims 13 to 15.
A computer program product, the computer program product comprising instructions, wherein the computer, when executed on a computer, causes the computer to implement the method of any one of claims 1 to 12.
A computer program product, the computer program product comprising instructions, wherein the computer, when executed on a computer, causes the computer to implement the method of any one of claims 13 to 15.
A chip device includes: an input interface, an output interface, at least one processor, and a memory, wherein the input interface, the output interface, the processor, and the memory communicate with each other through an internal connection path, and the processing The apparatus is operative to execute code in the memory, the chip apparatus implementing the method of any one of claims 1 to 12 when the processor executes the code.
A chip device includes: an input interface, an output interface, at least one processor, and a memory, wherein the input interface, the output interface, the processor, and the memory communicate with each other through an internal connection path, and the processing The chip device is operative to execute the code in the memory, and when the processor executes the code, the chip device implements the method of any one of the preceding claims 13 to 15.