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CN110011758A - ACK transmission optimization method, relevant apparatus and the system of TCP under a kind of multilink - Google Patents

ACK transmission optimization method, relevant apparatus and the system of TCP under a kind of multilink Download PDF

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Publication number
CN110011758A
CN110011758A CN201910089574.3A CN201910089574A CN110011758A CN 110011758 A CN110011758 A CN 110011758A CN 201910089574 A CN201910089574 A CN 201910089574A CN 110011758 A CN110011758 A CN 110011758A
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CN
China
Prior art keywords
ack message
ack
llc
message
transmitting terminal
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Granted
Application number
CN201910089574.3A
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Chinese (zh)
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CN110011758B (en
Inventor
李继龙
施玉海
张帆
王晓光
王晓霞
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Research Institute Of Radio And Television Science State Administration Of Radio And Television
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Research Institute Of Radio And Television Science State Administration Of Radio And Television
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Priority to CN201910089574.3A priority Critical patent/CN110011758B/en
Publication of CN110011758A publication Critical patent/CN110011758A/en
Application granted granted Critical
Publication of CN110011758B publication Critical patent/CN110011758B/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/1607Details of the supervisory signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163In-band adaptation of TCP data exchange; In-band control procedures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22Parsing or analysis of headers

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Quality & Reliability (AREA)
  • Communication Control (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses the ACK transmission optimization methods of TCP under multilink a kind of, relevant apparatus and system, the present invention polymerize the ACK message of multiple TCP connections by transmitting terminal LLC encapsulation, and makes the ACK message prior in preset more transmission links while repeating to transmit the ACK message, receiving end is after receiving the ACK message, select the ACK message preferably reached to upper layer transport, and lose the duplicate ACK message of late detection, to improve the transmission quality of ACK message end to end, and then effectively solve the problems, such as that the transmission quality of ACK message end to end in the prior art is poor.

Description

ACK transmission optimization method, relevant apparatus and the system of TCP under a kind of multilink
Technical field
The present invention relates to fields of communication technology, more particularly to ACK transmission optimization method, the phase of TCP under a kind of multilink Close apparatus and system.
Background technique
Delay and loss that link transmission ACK message generates can seriously affect the value of measurement two-way time RTT, and TCP is adopted With a highly dynamic algorithm, come continuous adjustment time interval, timeout interval RTO is by two-way time RTT It calculates.If timeout interval RTO is too short to may cause a large amount of unnecessary re-transmissions, performance will lead to if too long Decline.So the transmission quality of ACK message seriously affects the performance of TCP Retransmission timeout.And how to improve end-to-end ACK message Transmission quality become the urgently technical issues that need to address now.
Summary of the invention
The present invention provides ACK transmission optimization method, relevant apparatus and the system of TCP under a kind of multilink, existing to solve The poor problem of the transmission quality of ACK message end to end in technology.
On the one hand, the present invention provides the ACK transmission optimization method of TCP under multilink a kind of, is applied to transmitting terminal, comprising: Polymerize the ACK message of multiple TCP connections by LLC encapsulation, and make the ACK message prior preset more transmission links simultaneously Repeat to transmit.
Preferably, the ACK message that multiple TCP connections are polymerize by LLC encapsulation, comprising: loaded by preset UDP The ACK message is encapsulated, the LLC frame head of encapsulation includes control for identifying the ACK message attribute, the ACK message attribute Frame and data frame, polymerization has different TCP connection ACK messages after the LLC frame head.
It is preferably, described that the ACK message is encapsulated by preset UDP load, further includes:
Encapsulate the head UDP and the mac frame head trailer information of respective links.
Preferably, the LLC frame head includes:
D/C, for mark data (0) or control (1);
TYPE, for indicating control frame type;
Packet length position is controlled, for indicating control payload length;
Control packet ID, indicate the LLC encapsulation UDP message so that transmitting terminal counterweight multiple connection receive message when carry out area Point.
Preferably, MTU is less than by the polymerization length of the ACK message of multiple TCP connections of LLC encapsulation polymerization.
On the other hand, the present invention provides the ACK transmission optimization method of TCP under multilink a kind of, is applied to receiving end, packet It includes: receiving the ACK message for polymerizeing multiple TCP connections by LLC encapsulation that the transmitting terminal is sent;Described in receiving ACK message is detected, and selects the ACK message preferably reached to upper layer transport, and lose the duplicate ACK message of late detection.
Preferably, the ACK message received is detected, selects the ACK message that preferably reaches to upper layer transport, Include: the ACK message that will be received the received ACK message of LLC preamble detecting whether be receive for the first time, if It is then to be parsed to the ACK message, and parsing is obtained into ACK message to upper layer transport.
In another aspect, the present invention provides a kind of transmitting terminal, the transmitting terminal includes processor and storage device, the storage Multiple instruction is stored in device to realize the configuration method of reference signal, the processor executes the multiple instruction with reality It is existing:
It polymerize the ACK message of multiple TCP connections by LLC encapsulation, and makes the ACK message prior in preset more transmission Link repeats to transmit simultaneously.
Another aspect, the present invention provide a kind of receiving end, and the receiving end includes processor and storage device, the storage Multiple instruction is stored in device to realize the configuration method of reference signal, the processor executes the multiple instruction with reality It is existing:
Receive the ACK message for polymerizeing multiple TCP connections by LLC encapsulation that the transmitting terminal is sent;
The ACK message received is detected, selects the ACK message preferably reached to upper layer transport, and lose The duplicate ACK message of late detection.
Also on the one hand, the present invention provides the ACK transmission optimization system of TCP under multilink a kind of, the system comprises Receiving end described in transmitting terminal described in any of the above-described kind and any of the above-described kind.
The present invention has the beneficial effect that:
The present invention polymerize the ACK message of multiple TCP connections by transmitting terminal LLC encapsulation, and the ACK message prior is made to exist Preset more transmission links repeat to transmit the ACK message simultaneously, and receiving end is after receiving the ACK message, and selection is preferably up to The ACK message reached loses the duplicate ACK message of late detection to upper layer transport, to improve ACK message end to end Transmission quality, and then effectively solve the problems, such as that the transmission quality of ACK message end to end in the prior art is poor.
Detailed description of the invention
Fig. 1 be the embodiment of the present invention a kind of multilink under TCP ACK transmission optimization method flow diagram;
Fig. 2 is the schematic diagram of the UDP tunnel encapsulation frame format of the embodiment of the present invention;
Fig. 3 is the schematic diagram of the LLC control frame head format of the embodiment of the present invention;
Fig. 4 be the embodiment of the present invention another multilink under TCP ACK transmission optimization method flow diagram.
Specific embodiment
Transmission quality in order to solve the problems, such as ACK message end to end in the prior art is poor, and the present invention passes through transmission It holds LLC encapsulation to polymerize the ACK message of multiple TCP connections, and preferentially repeats to transmit the ACK simultaneously in preset more transmission links Message, receiving end selects the ACK message preferably reached to upper layer transport after receiving the ACK message, and loses late detection Duplicate ACK message, to improve the transmission quality of ACK message end to end.Below in conjunction with attached drawing and embodiment, to this Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not Limit the present invention.
Embodiment of the method one
The embodiment of the invention provides the ACK transmission optimization method of TCP under multilink a kind of, the executing subject of this method is Transmitting terminal, referring to Fig. 1, this method comprises:
S101, the ACK message for polymerizeing multiple TCP connections by LLC encapsulation;
S102, ACK message prior in preset more transmission links while being repeated to transmit.
That is, the embodiment of the present invention polymerize the ACK message of multiple TCP connections by transmitting terminal LLC encapsulation, and preferential It repeats to transmit the ACK message simultaneously in preset more transmission links, to ensure that receiving end can effectively receive ACK report Text, that is, ensure that effective transmission of ACK message, and then improve the transmission quality of ACK message end to end.
It should be noted that transmitting terminal described in the embodiment of the present invention and receiving end are that can arbitrarily pass through the networks such as wifi The terminal of connection, e.g., computer, server etc..
The step of embodiment of the present invention polymerize the ACK message of multiple TCP connections by LLC encapsulation specifically includes: by pre- If UDP load encapsulate the ACK message, the LLC frame head of encapsulation is for identifying the ACK message attribute, the ACK message category Property include control frame and data frame, polymerization has different TCP connection ACK messages after the LLC frame head.
When it is implemented, the embodiment of the present invention encapsulates the ACK message by preset UDP load, and encapsulate corresponding chain The head UDP on road and mac frame head trailer information.
Wherein, LLC frame head described in the embodiment of the present invention includes:
D/C, for mark data (0) or control (1);
TYPE, for indicating control frame type;
Packet length position is controlled, for indicating control payload length;
Control packet ID, indicate the LLC encapsulation UDP message so that transmitting terminal counterweight multiple connection receive message when carry out area Point.
It should be noted that polymerization of the embodiment of the present invention by the ACK message of multiple TCP connections of LLC encapsulation polymerization Length is less than MTU.
On the whole, the core concept of the embodiment of the present invention is the ACK message for polymerizeing multiple TCP connections by LLC encapsulation, And make the ACK message prior in distinctive more transmission links while repeating to transmit, to guarantee effective transmission of ACK message.
Since the ACK message of TCP is very important for the communication end to end of TCP, in order to end-to-end logical In the case of the multilink of letter, the communication quality of TCP is improved, the present invention polymerize the ACK message of multiple TCP connections by LLC encapsulation, Ensure the ACK message prior transmission of TCP, and by repeating to transmit identical polymerization ACK simultaneously in distinctive more transmission links Message reduces the packet loss and propagation delay time of ACK.It is distinguished under multilink by the LLC frame head id field of ACK message receiving end Whether the polymerization ACK message of transmission repeats, and selects the ACK message preferentially reached to upper layer transport, loses late detection repetition ACK message, to improve the validity packet loss and time delay of ACK (reduce) of the ACK message transmissions of TCP,
The embodiment of the present invention realizes the ACK message of multiple TCP connections at this by the customized LLC encapsulation deblocking of UDP Unified carrying, UDP tunnel encapsulation frame format are as shown in Figure 2 on transmission link.
For the embodiment of the present invention by customized UDP tunnel encapsulation, LLC frame head is used to distinguish the attribute (control of the message Frame or data frame) below by different TCP connection ACK message convergences together, realize the tunnel the UDP LLC encapsulation process.
The format of the LLC control frame head of the embodiment of the present invention is as shown in Figure 3.
It D/C:1, distinguishes data (0) or controls (1);
TYPE:4, for indicating control frame type;
It controls packet length: 11, controlling payload length for indicating;
Control packet ID:8, indicates the UDP message of LLC encapsulation, carries out area when repeating for transmitting terminal and receive the message Point;
Reserved field: 1 byte is convenient for Project Realization.
UDP of embodiment of the present invention tunnel LLC encapsulates decapsulation process
The ACK message source of TCP can transmit the ACK message of a large amount of different TCP connections, obtain these in transmitting terminal ACK message (only message of the interception containing only ACK option does not include the ACK option that data packet carries), it is (poly- then to polymerize N number of ACK Close length and be less than MTU), the TYPE of LLC control frame head is set as 0000, and length is set as the total length after polymerization, control packet ID This is to repeat to send receiving end after polymerization ACK message under multilink and distinguish duplicate message, and ID is set as random when booting Value, then one different polymerization ACK message of every transmission adds 1, then encapsulates the head UDP and the mac frame head postamble of respective links Information.
The decapsulation process of the embodiment of the present invention includes:
When receive polymerization ACK message when be first depending on LLC frame head TYPE field distinguish be polymerization ACK message, then TCP frame originating point information is passed sequentially through to unseal the ACK frame of each TCP, according to the LENGTH of LLC frame head until solving the last one ACK frame.
Detailed explanation and illustration will be carried out to method of the present invention by a specific embodiment below:
In multilink, in order to ensure the low packet loss ratio and low time delay of the ACK message transmissions of TCP, by multichain Road carries out the multiple transmission convergence ACK message of LLC Link Encapsulation using more tunnels UDP.
The transmitting terminal of the embodiment of the present invention each link on multilink will carry out corresponding DUP tunnel encapsulation process: Mac frame head postamble, UDP frame head bind respective links both end information, and LLC is then encapsulated polymerization ACK message and is tied to each tunnel It carries out repeating transmission on road, transmitting terminal wants real-time update LLC frame head id field (one LLC encapsulated frame ID of every transmission adds 1 automatically).
The receiving end of the embodiment of the present invention is from the message after the polymerization that each link receives, since the time delay of each link is lost Packet is different from, and it is repetition and random ordering that receiving end, which receives message, and receiving end decapsulation is selected according to the id field of LLC frame head The message preferentially reached sends upper layer parsing to, is lost if back receives duplicate message according to id field, in this way Solve the problems, such as the repetition and random ordering of the multiple transmission of Multiple tunnel.
The embodiment of the present invention realizes that polymerizeing multiple TCP connection data transmission generates a large amount of ACK by customized UDP message Message transmits on proprietary tunnel, reduces network transport load.
The embodiment of the present invention by proprietary multi link communications network with multilink repeat transmission convergence ACK message, The packet loss of transmission ACK message is reduced, the time delay of transmission ACK is reduced.
Embodiment of the method two
The embodiment of the invention provides the ACK transmission optimization method of TCP under multilink a kind of, the executing subject of this method is Receiving end, referring to fig. 4, this method comprises:
S401, the ACK message for polymerizeing multiple TCP connections by LLC encapsulation that the transmitting terminal is sent is received;
S402, the ACK message received is detected, selects the ACK message preferably reached to upper layer transport, and Lose the duplicate ACK message of late detection.
That is, the embodiment of the present invention polymerize the ACK message of multiple TCP connections by transmitting terminal LLC encapsulation, and preferential It repeats to transmit the ACK message simultaneously in preset more transmission links, after receiving the ACK message, selection is preferred for receiving end The ACK message of arrival loses the duplicate ACK message of late detection to upper layer transport, to improve ACK message end to end Transmission quality.
It should be noted that transmitting terminal described in the embodiment of the present invention and receiving end are that can arbitrarily pass through the networks such as wifi The terminal of connection, e.g., computer, server etc..
When it is implemented, the embodiment of the present invention detects the ACK message received, what selection preferably reached ACK message is to upper layer transport, comprising: is by the received ACK message of the LLC preamble detecting of the ACK message received No is to receive for the first time, if it is, parsing to the ACK message, and parsing is obtained ACK message to upper layer transport.
The decapsulation process of receiving end of the embodiment of the present invention includes:
When receive polymerization ACK message when be first depending on LLC frame head TYPE field distinguish be polymerization ACK message, then TCP frame originating point information is passed sequentially through to unseal the ACK frame of each TCP, according to the LENGTH of LLC frame head until solving the last one ACK frame.
Detailed explanation and illustration will be carried out to method of the present invention by a specific embodiment below:
In multilink, in order to ensure the low packet loss ratio and low time delay of the ACK message transmissions of TCP, by multichain Road carries out the multiple transmission convergence ACK message of LLC Link Encapsulation using more tunnels UDP.
The transmitting terminal of the embodiment of the present invention each link on multilink will carry out corresponding DUP tunnel encapsulation process: Mac frame head postamble, UDP frame head bind respective links both end information, and LLC is then encapsulated polymerization ACK message and is tied to each tunnel It carries out repeating transmission on road, transmitting terminal wants real-time update LLC frame head id field (one LLC encapsulated frame ID of every transmission adds 1 automatically).
The receiving end of the embodiment of the present invention is from the message after the polymerization that each link receives, since the time delay of each link is lost Packet is different from, and it is repetition and random ordering that receiving end, which receives message, and receiving end decapsulation is selected according to the id field of LLC frame head The message preferentially reached sends upper layer parsing to, is lost if back receives duplicate message according to id field, in this way Solve the problems, such as the repetition and random ordering of the multiple transmission of Multiple tunnel.
The embodiment of the present invention realizes that polymerizeing multiple TCP connection data transmission generates a large amount of ACK by customized UDP message Message transmits on proprietary tunnel, reduces network transport load.
The embodiment of the present invention by proprietary multi link communications network with multilink repeat transmission convergence ACK message, The packet loss of transmission ACK message is reduced, the time delay of transmission ACK is reduced.
The related content of the embodiment of the present invention can be found in embodiment of the method a part and be understood, no longer superfluous in detail herein It states.
Terminal embodiment one
The embodiment of the invention provides a kind of transmitting terminal, the transmitting terminal includes processor and storage device, the storage Multiple instruction is stored in device to realize the configuration method of reference signal, the processor executes the multiple instruction with reality It is existing:
It polymerize the ACK message of multiple TCP connections by LLC encapsulation, and makes the ACK message prior in preset more transmission Link repeats to transmit simultaneously.
The related content of the embodiment of the present invention can be found in embodiment of the method a part and be understood, no longer superfluous in detail herein It states.
Terminal embodiment two
The embodiment of the invention provides a kind of receiving end, the receiving end includes processor and storage device, the storage Multiple instruction is stored in device to realize the configuration method of reference signal, the processor executes the multiple instruction with reality It is existing:
Receive the ACK message for polymerizeing multiple TCP connections by LLC encapsulation that the transmitting terminal is sent;
The ACK message received is detected, selects the ACK message preferably reached to upper layer transport, and lose The duplicate ACK message of late detection.
The related content of the embodiment of the present invention can be found in embodiment of the method one and two part of embodiment of the method is understood, This is no longer described in detail.
System embodiment
The embodiment of the invention provides the ACK transmission optimization systems of TCP under multilink a kind of, and the system comprises terminal realities Apply any receiving end in transmitting terminal and terminal embodiment two any in example one.
Related content in the embodiment of the present invention can refer to terminal embodiment and embodiment of the method part is understood, herein It repeats no more.
Although for illustrative purposes, the preferred embodiment of the present invention has been disclosed, those skilled in the art will recognize It is various improve, increase and replace be also it is possible, therefore, the scope of the present invention should be not limited to the above embodiments.

Claims (10)

1. a kind of ACK transmission optimization method of TCP under multilink, which is characterized in that be applied to transmitting terminal, comprising:
It polymerize the ACK message of multiple TCP connections by LLC encapsulation, and makes the ACK message prior in preset more transmission links Repeat to transmit simultaneously.
2. the method according to claim 1, wherein the ACK for polymerizeing multiple TCP connections by LLC encapsulation Message, comprising:
The ACK message is encapsulated by preset UDP load, the LLC frame head of encapsulation is for identifying the ACK message attribute, institute Stating ACK message attribute includes control frame and data frame, and polymerization has different TCP connection ACK messages after the LLC frame head.
3. according to the method described in claim 3, it is characterized in that, described encapsulate the ACK report by preset UDP load Text, further includes:
Encapsulate the head UDP and the mac frame head trailer information of respective links.
4. according to the method described in claim 3, it is characterized in that,
The LLC frame head includes:
D/C, for mark data (0) or control (1);
TYPE, for indicating control frame type;
Packet length position is controlled, for indicating control payload length;
Control packet ID, indicate the LLC encapsulation UDP message so that transmitting terminal counterweight multiple connection receive message when distinguish.
5. the method according to claim 1, wherein
It is less than MTU by the polymerization length of the ACK message of multiple TCP connections of LLC encapsulation polymerization.
6. a kind of ACK transmission optimization method of TCP under multilink, which is characterized in that be applied to receiving end, comprising:
Receive the ACK message for polymerizeing multiple TCP connections by LLC encapsulation that the transmitting terminal is sent;
The ACK message received is detected, selects the ACK message preferably reached to upper layer transport, and lose the later period Detect duplicate ACK message.
7. according to the method described in claim 6, selection is excellent it is characterized in that, the ACK message received is detected The ACK message that reaches is chosen to upper layer transport, comprising:
By the received ACK message of the LLC preamble detecting of the ACK message received whether be receive for the first time, if so, Then the ACK message is parsed, and parsing is obtained into ACK message to upper layer transport.
8. a kind of transmitting terminal, which is characterized in that the transmitting terminal includes processor and storage device, storage in the storage device There is multiple instruction to realize the configuration method of reference signal, the processor executes the multiple instruction to realize:
It polymerize the ACK message of multiple TCP connections by LLC encapsulation, and makes the ACK message prior in preset more transmission links Repeat to transmit simultaneously.
9. a kind of receiving end, which is characterized in that the receiving end includes processor and storage device, storage in the storage device There is multiple instruction to realize the configuration method of reference signal, the processor executes the multiple instruction to realize:
Receive the ACK message for polymerizeing multiple TCP connections by LLC encapsulation that the transmitting terminal is sent;
The ACK message received is detected, selects the ACK message preferably reached to upper layer transport, and lose the later period Detect duplicate ACK message.
10. the ACK transmission optimization system of TCP under a kind of multilink, which is characterized in that transmitting terminal according to any one of claims 8 and Receiving end as claimed in claim 9.
CN201910089574.3A 2019-01-30 2019-01-30 ACK transmission optimization method of TCP under multilink, related device and system Active CN110011758B (en)

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CN113194509A (en) * 2021-04-30 2021-07-30 武汉理工大学 Multi-network fusion transmission system and transmission method based on QoS
CN113497678A (en) * 2020-04-03 2021-10-12 展讯通信(上海)有限公司 Information processing method, device and storage medium

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