CN110011758B - ACK transmission optimization method of TCP under multilink, related device and system - Google Patents
ACK transmission optimization method of TCP under multilink, related device and system Download PDFInfo
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- CN110011758B CN110011758B CN201910089574.3A CN201910089574A CN110011758B CN 110011758 B CN110011758 B CN 110011758B CN 201910089574 A CN201910089574 A CN 201910089574A CN 110011758 B CN110011758 B CN 110011758B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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Abstract
The invention discloses an ACK transmission optimization method of TCP under multilink, a related device and a system, wherein, the invention packages and aggregates ACK messages connected with a plurality of TCP by a sending end LLC, and makes the ACK messages repeat transmission to the ACK messages at the same time in a preset multi-transmission link preferentially, after receiving the ACK messages, a receiving end selects the preferred ACK messages to transmit to an upper layer, and discards the repeated ACK messages detected in the later period, thereby improving the transmission quality of the end-to-end ACK messages, and further effectively solving the problem of poor transmission quality of the end-to-end ACK messages in the prior art.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an ACK transmission optimization method, a related apparatus, and a system for TCP under a multilink.
Background
The delay and loss generated by the transmission of ACK message by link can seriously affect the value of RTT, and TCP adopts a highly dynamic algorithm to continuously adjust the time interval, and the time-out time interval RTO is calculated by RTT. The time-out interval RTO may result in a large number of unnecessary retransmissions if it is too short and in a performance degradation if it is too long. Therefore, the transmission quality of the ACK packet seriously affects the performance of the TCP timeout retransmission. How to improve the transmission quality of the end-to-end ACK packet becomes a technical problem to be urgently solved.
Disclosure of Invention
The invention provides an ACK transmission optimization method of TCP under multilink, a related device and a system, which aim to solve the problem that the transmission quality of an end-to-end ACK message in the prior art is poor.
On one hand, the invention provides an ACK transmission optimization method of TCP under multilink, which is applied to a sending end and comprises the following steps: and aggregating the ACK messages of a plurality of TCP connections through LLC encapsulation, and enabling the ACK messages to be transmitted repeatedly in a preset plurality of transmission links preferentially.
Preferably, the aggregating the ACK packet of the multiple TCP connections through the LLC encapsulation includes: and encapsulating the ACK message through a preset UDP load, wherein the encapsulated LLC frame header is used for identifying the attribute of the ACK message, the attribute of the ACK message comprises a control frame and a data frame, and different TCP connection ACK messages are polymerized behind the LLC frame header.
Preferably, the encapsulating the ACK packet by a preset UDP load further includes:
and encapsulating UDP (user datagram protocol) headers and MAC (media access control) header and frame tail information of corresponding links.
Preferably, the LLC frame header includes:
a D/C bit identifying whether data (0) or control (1);
TYPE bit, used to mark control frame TYPE;
a control packet length bit for marking a control load length;
and the control packet ID marks the UDP message encapsulated by the LLC so as to distinguish the repeatedly received messages by the sending end.
Preferably, the aggregation length of the ACK messages of the multiple TCP connections aggregated by the LLC encapsulation is smaller than the MTU.
On the other hand, the invention provides an ACK transmission optimization method of TCP under multilink, which is applied to a receiving end and comprises the following steps: receiving an ACK message which is sent by the sending end and is formed by aggregating a plurality of TCP connections through LLC encapsulation; and detecting the received ACK message, selecting the optimal ACK message to be transmitted to an upper layer, and discarding the ACK message with repeated detection in the later period.
Preferably, the detecting the received ACK packet, and selecting the ACK packet that preferably arrives to transmit to an upper layer, includes: and detecting whether the received ACK message is received for the first time by using the LLC frame header of the received ACK message, if so, analyzing the ACK message, and transmitting the analyzed ACK message to an upper layer.
In another aspect, the present invention provides a transmitting end, where the transmitting end includes a processor and a storage device, where the storage device stores a plurality of instructions to implement a reference signal configuration method, and the processor executes the plurality of instructions to implement:
and aggregating the ACK messages of a plurality of TCP connections through LLC encapsulation, and enabling the ACK messages to be transmitted repeatedly in a preset plurality of transmission links preferentially.
In another aspect, the present invention provides a receiving end, where the receiving end includes a processor and a storage device, where the storage device stores a plurality of instructions to implement a reference signal configuration method, and the processor executes the plurality of instructions to implement:
receiving an ACK message which is sent by the sending end and is formed by aggregating a plurality of TCP connections through LLC encapsulation;
and detecting the received ACK message, selecting the optimal ACK message to be transmitted to an upper layer, and discarding the ACK message with repeated detection in the later period.
In another aspect, the present invention provides an ACK transmission optimization system for TCP under a multilink, where the system includes any one of the above-mentioned transmitting ends and any one of the above-mentioned receiving ends.
The invention has the following beneficial effects:
according to the invention, the ACK messages connected with a plurality of TCP are packaged and aggregated by the LLC of the sending end, the ACK messages are preferentially and repeatedly transmitted in a plurality of preset transmission links, after the receiving end receives the ACK messages, the preferably arrived ACK messages are selected to be transmitted to an upper layer, and the repeated ACK messages detected in a later period are discarded, so that the transmission quality of the end-to-end ACK messages is improved, and the problem of poor transmission quality of the end-to-end ACK messages in the prior art is effectively solved.
Drawings
Fig. 1 is a flowchart illustrating an ACK transmission optimization method of TCP under a multilink according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a UDP tunnel encapsulation frame format according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a format of an LLC control frame header according to an embodiment of the invention;
fig. 4 is a flowchart illustrating another method for optimizing ACK transmission in TCP under multiple links according to an embodiment of the present invention.
Detailed Description
In order to solve the problem of poor transmission quality of end-to-end ACK messages in the prior art, the invention packages and aggregates the ACK messages connected with a plurality of TCP through a sending end LLC, and preferentially and repeatedly transmits the ACK messages in a plurality of preset transmission links at the same time, and a receiving end selects the preferentially arrived ACK message to transmit to an upper layer after receiving the ACK message and discards the ACK message repeatedly detected in a later period, thereby improving the transmission quality of the end-to-end ACK messages. The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Method embodiment one
An embodiment of the present invention provides an ACK transmission optimization method for TCP under a multilink, where an execution main body of the method is a sending end, and referring to fig. 1, the method includes:
s101, packaging and aggregating ACK messages of a plurality of TCP connections through LLC;
and S102, the ACK messages are transmitted in a preset multi-transmission link repeatedly at the same time.
That is to say, in the embodiment of the present invention, the sending end LLC encapsulates and aggregates the ACK packets connected by multiple TCP, and preferentially and repeatedly transmits the ACK packets at the same time in the preset multiple transmission links, thereby ensuring that the receiving end can effectively receive the ACK packets, that is, ensuring effective transmission of the ACK packets, and further improving the transmission quality of the end-to-end ACK packets.
It should be noted that the sending end and the receiving end in the embodiment of the present invention are any terminals, such as a computer, a server, and the like, capable of being connected through a network such as wifi.
The step of aggregating the ACK messages of a plurality of TCP connections through LLC encapsulation in the embodiment of the invention specifically comprises the following steps: and encapsulating the ACK message through a preset UDP load, wherein the encapsulated LLC frame header is used for identifying the attribute of the ACK message, the attribute of the ACK message comprises a control frame and a data frame, and different TCP connection ACK messages are polymerized behind the LLC frame header.
In specific implementation, the ACK packet is encapsulated by a preset UDP load, and the UDP header and the MAC header and trailer information of the corresponding link are encapsulated.
The LLC frame header in the embodiment of the present invention includes:
a D/C bit identifying whether data (0) or control (1);
TYPE bit, used to mark control frame TYPE;
a control packet length bit for marking a control load length;
and the control packet ID marks the UDP message encapsulated by the LLC so as to distinguish the repeatedly received messages by the sending end.
It should be noted that, in the embodiment of the present invention, the aggregation length of the ACK packet of the multiple TCP connections aggregated by the LLC encapsulation is smaller than the MTU.
Generally, the core idea of the embodiment of the present invention is to aggregate ACK packets of multiple TCP connections through LLC encapsulation, and make the ACK packets be preferentially repeatedly transmitted at the same time in multiple specific transmission links, thereby ensuring effective transmission of the ACK packets.
Because the ACK message of the TCP is very important for the end-to-end communication of the TCP, in order to improve the communication quality of the TCP under the condition of multiple links of the end-to-end communication, the ACK messages of a plurality of TCP connections are packaged and aggregated by the LLC, the preferential transmission of the ACK messages of the TCP is ensured, and the packet loss rate and the transmission delay of the ACK are reduced by repeatedly transmitting the same aggregated ACK message at the same time in a special multiple transmission link. The receiving end distinguishes whether the aggregation ACK message transmitted under the multilink is repeated or not through the LLC frame head ID field of the ACK message, selects the ACK message which arrives preferentially to transmit to the upper layer, discards the ACK message which is detected repeatedly at the later stage, thereby improving the validity of the ACK message transmission of the TCP (namely reducing the packet loss rate and the time delay of the ACK),
the embodiment of the invention realizes the uniform bearing of the ACK messages of a plurality of TCP connections on the transmission link by UDP self-defined LLC encapsulation and decapsulation, and the UDP tunnel encapsulation frame format is shown as figure 2.
In the embodiment of the invention, different TCP connection ACK messages are aggregated together after the LLC frame header is used for distinguishing the attribute (a control frame or a data frame) of the message through self-defined UDP tunnel encapsulation, so that the LLC encapsulation process of the UDP tunnel is realized.
The format of the LLC control frame header of the embodiment of the present invention is shown in fig. 3.
D/C is 1 bit, and distinguishes data (0) or control (1);
TYPE: 4 bits for marking the control frame type;
controlling the packet length: 11 bits for marking the control load length;
control packet ID: 8 bits, marking the UDP message encapsulated by the LLC, and being used for distinguishing when the sending end repeatedly receives the message;
and (4) reserving a field: 1 byte, which is convenient for engineering realization.
The LLC encapsulation and decapsulation process of the UDP tunnel comprises the following steps:
an ACK message sending end of the TCP can transmit a large number of ACK messages connected with different TCP, the ACK messages are obtained at the sending end (only the messages containing the ACK option are intercepted, the ACK option carried by a data packet is not included), then N ACKs are aggregated (the aggregation length is smaller than MTU), TYPE of an LLC control frame header is set to 0000, the length is set to be the total length after aggregation, ID of a control packet is used for distinguishing repeated messages by a receiving end after the aggregated ACK messages are repeatedly sent under multiple links, ID is set to be a random value when the receiving end starts up, 1 is added when each different aggregated ACK message is sent, and then UDP (user datagram protocol) headers and MAC frame header tail information of corresponding links are packaged.
The decapsulation process of the embodiment of the invention comprises the following steps:
when receiving the aggregate ACK message, firstly distinguishing the aggregate ACK message according to the LLC frame header TYPE field, then sequentially decapsulating each TCP ACK frame through TCP frame header information, and according to the LENGTH of the LLC frame header until solving the last ACK frame.
The process according to the invention is explained and illustrated in detail below by means of a specific example:
in the case of multiple links, in order to ensure low packet loss rate and low time delay of the ACK packet transmission of TCP, the LLC link encapsulation multiple transmission aggregate ACK packet is performed by using multiple UDP tunnels over the multiple links.
The sending end of the embodiment of the invention needs to perform the corresponding DUP tunnel encapsulation process on each link of the multi-link: and binding the MAC frame head and the UDP frame head to corresponding link double-end information, then binding the LLC encapsulation aggregation ACK message to each tunnel for repeated transmission, and updating an LLC frame head ID field in real time by a transmitting end (adding 1 automatically when transmitting one LLC encapsulation frame ID).
The receiving end of the embodiment of the invention selects the message which arrives preferentially according to the ID field of the LLC frame header to be transmitted to the upper layer for analysis, and discards the repeated message if the repeated message is received later according to the ID field, thereby solving the problems of repetition and disorder of multi-tunnel multi-transmission.
The embodiment of the invention realizes the aggregation of a plurality of TCP connection data transmission by the user-defined UDP message to generate a large amount of ACK messages to be transmitted on the special tunnel, thereby reducing the network transmission load.
The embodiment of the invention reduces the packet loss rate of the transmitted ACK message and reduces the time delay of the transmitted ACK message by repeatedly transmitting the aggregated ACK message by using the multilinks in the proprietary multilink communication network.
Method embodiment two
An embodiment of the present invention provides an ACK transmission optimization method for TCP under a multilink, where an execution main body of the method is a receiving end, see fig. 4, and the method includes:
s401, receiving an ACK message which is sent by the sending end and formed by packaging and aggregating a plurality of TCP connections through an LLC;
s402, the received ACK message is detected, the preferred ACK message is selected to be transmitted to an upper layer, and the ACK message with repeated detection in the later period is discarded.
That is to say, in the embodiment of the present invention, the sending end LLC packages and aggregates the ACK messages of multiple TCP connections, and preferentially and repeatedly transmits the ACK messages at the same time in multiple preset transmission links, and after receiving the ACK messages, the receiving end selects the ACK messages that are preferably arrived to transmit to the upper layer, and discards the ACK messages that are detected repeatedly at the later stage, thereby improving the transmission quality of the end-to-end ACK messages.
It should be noted that the sending end and the receiving end in the embodiment of the present invention are any terminals, such as a computer, a server, and the like, capable of being connected through a network such as wifi.
In specific implementation, the embodiment of the present invention detects the received ACK packet, and selects an ACK packet that is preferably arrived to be transmitted to an upper layer, including: and detecting whether the received ACK message is received for the first time by using the LLC frame header of the received ACK message, if so, analyzing the ACK message, and transmitting the analyzed ACK message to an upper layer.
The decapsulation process of the receiving end of the embodiment of the invention comprises the following steps:
when receiving the aggregate ACK message, firstly distinguishing the aggregate ACK message according to the LLC frame header TYPE field, then sequentially decapsulating each TCP ACK frame through TCP frame header information, and according to the LENGTH of the LLC frame header until solving the last ACK frame.
The process according to the invention is explained and illustrated in detail below by means of a specific example:
in the case of multiple links, in order to ensure low packet loss rate and low time delay of the ACK packet transmission of TCP, the LLC link encapsulation multiple transmission aggregate ACK packet is performed by using multiple UDP tunnels over the multiple links.
The sending end of the embodiment of the invention needs to perform the corresponding DUP tunnel encapsulation process on each link of the multi-link: and binding the MAC frame head and the UDP frame head to corresponding link double-end information, then binding the LLC encapsulation aggregation ACK message to each tunnel for repeated transmission, and updating an LLC frame head ID field in real time by a transmitting end (adding 1 automatically when transmitting one LLC encapsulation frame ID).
The receiving end of the embodiment of the invention selects the message which arrives preferentially according to the ID field of the LLC frame header to be transmitted to the upper layer for analysis, and discards the repeated message if the repeated message is received later according to the ID field, thereby solving the problems of repetition and disorder of multi-tunnel multi-transmission.
The embodiment of the invention realizes the aggregation of a plurality of TCP connection data transmission by the user-defined UDP message to generate a large amount of ACK messages to be transmitted on the special tunnel, thereby reducing the network transmission load.
The embodiment of the invention reduces the packet loss rate of the transmitted ACK message and reduces the time delay of the transmitted ACK message by repeatedly transmitting the aggregated ACK message by using the multilinks in the proprietary multilink communication network.
The related content of the embodiments of the present invention can be understood by referring to a part of the method embodiments, and detailed description thereof is omitted.
Terminal embodiment one
The embodiment of the invention provides a sending end, which comprises a processor and a storage device, wherein the storage device stores a plurality of instructions to realize a reference signal configuration method, and the processor executes the instructions to realize that:
and aggregating the ACK messages of a plurality of TCP connections through LLC encapsulation, and enabling the ACK messages to be transmitted repeatedly in a preset plurality of transmission links preferentially.
The related content of the embodiments of the present invention can be understood by referring to a part of the method embodiments, and detailed description thereof is omitted.
Terminal embodiment two
The embodiment of the invention provides a receiving end, which comprises a processor and a storage device, wherein a plurality of instructions are stored in the storage device to realize a configuration method of a reference signal, and the processor executes the instructions to realize that:
receiving an ACK message which is sent by the sending end and is formed by aggregating a plurality of TCP connections through LLC encapsulation;
and detecting the received ACK message, selecting the optimal ACK message to be transmitted to an upper layer, and discarding the ACK message with repeated detection in the later period.
The related content of the embodiments of the present invention can be understood by referring to the first method embodiment and the second method embodiment, and detailed description is omitted here.
System embodiment
The embodiment of the invention provides an ACK transmission optimization system of TCP under multilink, which comprises a sending end in any one of terminal embodiments and a receiving end in any one of terminal embodiments.
The related content in the embodiments of the present invention can be understood by referring to the terminal embodiments and the method embodiments, and will not be described herein again.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. An ACK transmission optimization method of TCP under multilink is characterized in that the method is applied to a sending end and comprises the following steps:
and aggregating the ACK messages connected with the plurality of TCP through LLC encapsulation, and enabling the ACK messages to be transmitted repeatedly in a preset multi-transmission link preferentially, so that a receiving end selects the ACK messages which arrive preferentially to be transmitted to an upper layer based on the received ACK messages, and discards the ACK messages which are detected repeatedly in a later period.
2. The method according to claim 1, wherein said aggregating ACK messages for multiple TCP connections via LLC encapsulation comprises:
and encapsulating the ACK message through a preset UDP load, wherein the encapsulated LLC frame header is used for identifying the attribute of the ACK message, the attribute of the ACK message comprises a control frame and a data frame, and different TCP connection ACK messages are polymerized behind the LLC frame header.
3. The method according to claim 2, wherein encapsulating the ACK packet with a predetermined UDP payload further comprises:
and encapsulating UDP (user datagram protocol) headers and MAC (media access control) header and frame tail information of corresponding links.
4. The method of claim 3,
the LLC frame header comprises:
a D/C bit identifying whether data (0) or control (1);
TYPE bit, used to mark control frame TYPE;
a control packet length bit for marking a control load length;
and the control packet ID marks the UDP message encapsulated by the LLC so as to distinguish the repeatedly received messages by the sending end.
5. The method of claim 1,
and the aggregation length of the ACK messages of the plurality of TCP connections aggregated by the LLC encapsulation is smaller than the MTU.
6. An ACK transmission optimization method of TCP under multilink is characterized in that the method is applied to a receiving end and comprises the following steps:
receiving an ACK message which is sent by a sending end and is formed by polymerizing a plurality of TCP connections through LLC encapsulation, wherein the ACK message is transmitted repeatedly by the sending end in a preset plurality of transmission links preferentially;
and detecting the received ACK message, selecting the ACK message which arrives preferentially to transmit to an upper layer, and discarding the ACK message which is detected repeatedly at the later stage.
7. The method of claim 6, wherein detecting the received ACK packet and selecting the ACK packet with priority arrival for transmission to an upper layer comprises:
and detecting whether the received ACK message is received for the first time by using the LLC frame header of the received ACK message, if so, analyzing the ACK message, and transmitting the analyzed ACK message to an upper layer.
8. A transmitting end, characterized in that the transmitting end includes a processor and a storage device, the storage device stores a plurality of instructions to implement a reference signal configuration method, and the processor executes the plurality of instructions to implement:
and aggregating the ACK messages connected with the plurality of TCP through LLC encapsulation, and enabling the ACK messages to be transmitted repeatedly in a preset multi-transmission link preferentially, so that a receiving end selects the ACK messages which arrive preferentially to be transmitted to an upper layer based on the received ACK messages, and discards the ACK messages which are detected repeatedly in a later period.
9. A receiving end, comprising a processor and a storage device, wherein the storage device stores a plurality of instructions to implement a reference signal configuration method, and the processor executes the plurality of instructions to implement:
receiving an ACK message which is sent by a sending end and is formed by polymerizing a plurality of TCP connections through LLC encapsulation, wherein the ACK message is transmitted repeatedly by the sending end in a preset plurality of transmission links preferentially;
and detecting the received ACK message, selecting the ACK message which arrives preferentially to transmit to an upper layer, and discarding the ACK message which is detected repeatedly at the later stage.
10. An ACK transmission optimization system for TCP under multiple links, comprising: the transmitting end of claim 8 and the receiving end of claim 9.
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| CN111901075B (en) * | 2020-07-16 | 2021-11-23 | 华中科技大学 | Multi-network convergence transmission method, transmission system and computer-readable storage medium |
| CN113194509B (en) * | 2021-04-30 | 2022-06-17 | 武汉理工大学 | Multi-network fusion transmission system and transmission method based on QoS |
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