CN105376173A - Sending window flow control method and terminal - Google Patents
Sending window flow control method and terminal Download PDFInfo
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- CN105376173A CN105376173A CN201410443894.1A CN201410443894A CN105376173A CN 105376173 A CN105376173 A CN 105376173A CN 201410443894 A CN201410443894 A CN 201410443894A CN 105376173 A CN105376173 A CN 105376173A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
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Abstract
The invention provides a sending window flow control method under an RUDP protocol. The method comprises the following steps that a sending terminal sends a message to a receiving terminal and simultaneously requests a receiver window size from the receiving terminal; the receiving terminal receives the message, and determines the receiver window size according to a receiving window size and an out-of-order queue size; the receiving terminal sends the determined receiver window size to the sending terminal; the sending terminal adjusts a sending window size according to the determined receiver window size, and carries out flow control through an adjusted sending window. In the above technical scheme, dynamical control to a sending window flow is realized.
Description
Technical field
The present invention relates to reliable User Datagram Protoco (UDP) (ReliableUDP, RUDP), particularly relate to the send window flow control methods under a kind of RUDP agreement and terminal.
Background technology
The reliable communication of current guarantee data is generally adopt transmission control protocol (TransmissionControlProtocol, TCP).But this agreement well can not adapt to current network application to the high efficiency of transfer of data and the adaptive requirement of bandwidth.AIMD (AdditiveIncreaseMultiplicativeDecrease) in Transmission Control Protocol, although algorithm decreases TCP congestion window, can not recover available bandwidth fast.In addition, the inequitable RTT (two-way time of TCP grouping) in TCP congestion control causes the concurrent TCP flow share of bandwidth partially having different RTT.Along with the increase of network bandwidth time delay product (BDP), what the algorithm of the RTT of TCP was serious limits the efficiency of Transmission Control Protocol in wide area network Distributed Calculation.
Another widely used agreement of transport layer is User Datagram Protoco (UDP) (UDP).UDP is message based host-host protocol, is mainly used to the network application supporting to need to transmit data between the computers.Be that different application retains its respective data transmission channel by use side slogan, udp protocol can realize the support simultaneously transmitted and receive data to application multinomial in synchronization.Udp protocol is a kind of host-host protocol not needing to connect, and has that efficiency is high, speed is fast and take the advantages such as resource is few, can significantly improve the efficiency of system transfers data in Effect-based operation communication and real-time system.But UDP does not ensure the reliable transmission mechanism transmitting data, can not meet the reliability requirement of application transfer data, message.
For realizing supporting high-performance data transmission, the advantage of TCP and UDP combines by relevant technical staff in the field, adds the controlling mechanism that some ensure data reliable delivery, create RUDP (ReliableUDP) on UDP.
RUDP is carried on UDP, and its reliability is by retransmit and acknowledgement mechanism ensures.Window traffic control mode under existing RUDP arranges send window and retransmission queue at transmitter side, when the data message sum being positioned at retransmission queue has exceeded the size of send window, stops sending datagram.In this window traffic control mode, send window size, once setting, follow-uply cannot to be revised, and when the data message being positioned at retransmission queue is less, cannot increase send window to increase the quantity sent datagram in time; When the data message being positioned at retransmission queue is more, send window also cannot be reduced to reduce the quantity sent datagram in time, flow control weak effect.
Summary of the invention
The invention provides a kind of send window flow control methods and terminal, to solve the technical problem how realizing send window flow being carried out to Dynamic controlling.
For solving the problems of the technologies described above, the invention provides a kind of send window flow control methods, described method comprises:
To the size of receiving terminal request recipient window while transmitting terminal sends message to receiving terminal;
Receiving terminal receives described message, determines recipient's window size according to receive window size and out of order queue size;
The recipient's window size determined is sent to transmitting terminal by receiving terminal;
Transmitting terminal, according to the described recipient's window size adjustment send window size determined, carries out flow control by the send window after adjustment.
Alternatively, describedly determine recipient's window size according to receive window size and out of order queue size, comprising:
The length of receive window and out of order queue is sued for peace, using summed result as recipient's length of window.
Alternatively, described transmitting terminal, according to the described recipient's window size adjustment send window size determined, comprising:
The length sum of described receive window and out of order queue is deducted the length of the result after the length of transmitting terminal retransmission queue as send window by transmitting terminal.
Alternatively,
Use RUDP (RUDP) to transmit data between described transmitting terminal and receiving terminal, and in RUDP message, increase the field of the size for identifying recipient's window.
For solving the problems of the technologies described above, present invention also offers a kind of transmitting terminal carrying out send window flow control, described transmitting terminal comprises: transmitting element, receiving element and window traffic control unit, wherein,
Described transmitting element, for the size to receiving terminal request recipient window while receiving terminal transmission message;
Described receiving element, for receiving recipient's window size from receiving terminal;
Described window traffic control unit, for according to described recipient's window size adjustment send window size, carries out flow control by the send window after adjustment.
Alternatively, described window traffic control unit, for adjusting send window size according to described recipient's window size, comprising:
When recipient's window size is the length summation of receive window and out of order queue, the length sum of described receive window and out of order queue is deducted the length of the result after the length of transmitting terminal retransmission queue as send window.
Alternatively,
Transmitting terminal uses RUDP (RUDP) to receiving terminal transmission data, and in RUDP message, increase the field of the size for identifying recipient's window.
For solving the problems of the technologies described above, present invention also offers a kind of receiving terminal of assisting send window flow control, described receiving terminal comprises: receiving element, recipient's window size computing unit, transmitting element, wherein:
Described receiving element, for the request from transmitting terminal receipt message and acquisition recipient window size;
Described recipient's window size computing unit, for determining recipient's window size according to receive window size and out of order queue size;
Described transmitting element, for sending the recipient determined window size to transmitting terminal.
Alternatively, described recipient's window size computing unit, for determining recipient's window size according to receive window size and out of order queue size, comprising:
The length of receive window and out of order queue is sued for peace, using summed result as recipient's length of window.
Alternatively,
Receiving terminal uses RUDP (RUDP) to transmitting terminal transmission data, and in RUDP message, increase the field of the size for identifying recipient's window.
Technique scheme transmitting terminal according to the flexible in size adjustment send window of recipient's window, can achieve the Dynamic controlling to transmitted traffic.
Accompanying drawing explanation
Fig. 1 is the send window flow control methods flow chart of the present embodiment;
Fig. 2 is the RUDP form schematic diagram that the present embodiment improves;
Fig. 3 is the transmitting terminal comprising modules figure carrying out send window flow control of the present embodiment;
Fig. 4 is the receiving terminal comprising modules figure of the assistance send window flow control of the present embodiment.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Fig. 1 is the send window flow control methods flow chart of the present embodiment.
To the size of receiving terminal request recipient window while S101 transmitting terminal sends message to receiving terminal;
Alternatively, as shown in Figure 2, the message of transmission is filled in " messagebody " field to the message format that transmitting terminal sends to receiving terminal, and the main distinction of this message and existing RUDP message is the field adding mark recipient window size; For distinguishing mutually with existing RUDP message format, represent message format as shown in Figure 2 with SRUDP message format;
In Fig. 2, SRUDP type of message is as shown in table 1:
S102 receiving terminal receives described message, determines recipient's window size according to receive window size and out of order queue size;
The recipient's window size determined is sent to transmitting terminal by S103 receiving terminal;
S104 transmitting terminal, according to the described recipient's window size adjustment send window size determined, carries out flow control by the send window after adjustment.
Suppose:
A: the size representing Maxwin MaxSndWind;
B: the size representing send window CurSndWind, B are for controlling the number of the message sent to receiving terminal, and the number sending message to receiving terminal can not more than B;
C: represent retransmission queue size RetranQueSize, C represents the message number that retransmission queue is used for buffer memory transmitting terminal and has sent, if transmitting terminal from from the response received the response message of receiving terminal sending message, then removes corresponding message from retransmission queue
D: represent transmit queue size SndQueSize; Transmit queue buffer memory upper strata needs the message sent, and when connection meets transmission condition, the message in transmit queue will be sent out and transfer to retransmission queue; Transmit queue can be a chained list;
A: represent maximum receive window MaxRcvWind size;
B: represent receive window CurRcvWind size, b, can not more than b from the number of transmitting terminal receipt message for controlling the number of the message received from transmitting terminal;
C: represent out of order queue size UnOrderQueSize, out of order queue is used for the message that buffer memory arrives receiving terminal in advance; As, transmitting terminal sends message s1, s2, s3, s4 according to the order of sequence, due to information drop-out or network delay, causes receiving terminal first to receive that s4 of s4. and can keep in out of order queue;
D: represent sequential queue size OrdQueSize, sequential queue is used for all message arriving local terminal according to the order of sequence of buffer memory, and it is an instantaneous queue, and life cycle arises from the ordered message that out of order queue turns over, and terminates in ordered message and is sent to application process.
Wherein, A=B+C+D; Formula 1
A=b+c+d; Formula 2
Exist because transmit queue is just interim, message is sent to and drives layer and release busy space, sequential queue is also just interim to be existed, message is sent to upper layer application and release busy space, therefore transmit queue size D and sequential queue size d depends on each node processes treatment effeciency, there is uncertainty, be not used in window control.
For ensureing to send and receive the balanced of data, need:
B+C=b+c formula 3
Convolution 1 ~ formula 3, can obtain
B=(b+c)-C formula 4
Therefore, in above-mentioned steps S103, (b+c) can be sent to transmitting terminal by receiving terminal; In above-mentioned steps S104, transmitting terminal is again by the length of the result of (b+c)-C as send window.
With a concrete application example, above-described embodiment is further elaborated below.
Step one: successful link setup;
Step 2: transmitting terminal will be positioned at " messagebody " field of the Article 1 message write SRUDP message of send window in transmit queue, fill in the message header of SRUDP message simultaneously, wherein, PackNo represents the message count of transmission, for the PackNo of a upper SRUDP message adds 1; AckNO is the sequence number of transmitting terminal from the maximum message the sequential queue that receiving terminal is known;
Step 3: transmitting terminal sends described SRUDP message, starts retransmission timer;
Step 4: receiving terminal receives described SRUDP message, out of order queue and/or sequential queue is upgraded according to the PackNo in SRUDP message, judge whether to need to reply transmission message at once simultaneously, if do not need to reply transmission message at once, continue to judge whether to need the message by sequential queue to send to application process, if do not needed, then continue to perform step 4; If need reply transmission message or judge to need the message by sequential queue to send to application process at once, perform step 5;
Step 5: receiving terminal fills in response message, will identify the field of recipient's window size in receive window size and out of order queue size sum write response message; AckNO is the message sequence number of this time response; PackNo represents the message count of transmission, for the PackNo of a upper response message adds 1; Receiving terminal sends the response message filled; Described response message can reply separately the SRUDP message of transmitting terminal for the receiving terminal not comprising " messagebody " field, also can for comprising the user data of " messagebody ";
Step 6: transmitting terminal receives response message, judge that whether retransmission timer is overtime, if there is no time-out, stop retransmission timer, transmitting terminal by the AckNO in response message compared with the maximum sequence number of message in retransmission queue, if both are equal, illustrate that the message of all transmissions of transmitting terminal all receives the response of receiving terminal, perform step 8; If both are unequal, delete the message from 1 ~ AckNO in retransmission queue, transmitting terminal resets retransmission timer, performs step 6; After transmitting terminal receives application message, if retransmission timer is overtime, perform step 7;
Step 7: transmitting terminal takes out Article 1 message write SRUDP message from retransmission queue, performs step 3,
Step 8: empty retransmission queue, according to the field determination send window size of the mark recipient window size received, continues to send data according to the send window size redefined.
Fig. 3 is the transmitting terminal comprising modules figure carrying out send window flow control of the present embodiment.
This transmitting terminal comprises: transmitting element, receiving element and window traffic control unit, wherein,
Described transmitting element, for the size to receiving terminal request recipient window while receiving terminal transmission message;
Described receiving element, for receiving recipient's window size from receiving terminal;
Described window traffic control unit, for according to described recipient's window size adjustment send window size, carries out flow control by the send window after adjustment;
Alternatively, described window traffic control unit, for adjusting send window size according to described recipient's window size, comprising:
When recipient's window size is the length summation of receive window and out of order queue, the length sum of described receive window and out of order queue is deducted the length of the result after the length of transmitting terminal retransmission queue as send window;
Alternatively, transmitting terminal uses RUDP (RUDP) to receiving terminal transmission data, and in RUDP message, increase the field of the size for identifying recipient's window, as shown in Figure 2.
Fig. 4 is the receiving terminal comprising modules figure of the assistance send window flow control of the present embodiment.
This receiving terminal comprises: receiving element, recipient's window size computing unit, transmitting element, wherein:
Described receiving element, for the request from transmitting terminal receipt message and acquisition recipient window size;
Described recipient's window size computing unit, for determining recipient's window size according to receive window size and out of order queue size;
Alternatively, described recipient's window size computing unit, for determining recipient's window size according to receive window size and out of order queue size, comprising:
The length of receive window and out of order queue is sued for peace, using summed result as recipient's length of window;
Described transmitting element, for sending the recipient determined window size to transmitting terminal.
Alternatively, receiving terminal uses RUDP (RUDP) to transmitting terminal transmission data, and in RUDP message, increase the field of the size for identifying recipient's window, as shown in Figure 2.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize, and correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
It should be noted that; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (10)
1. a send window flow control methods, is characterized in that, described method comprises:
To the size of receiving terminal request recipient window while transmitting terminal sends message to receiving terminal;
Receiving terminal receives described message, determines recipient's window size according to receive window size and out of order queue size;
The recipient's window size determined is sent to transmitting terminal by receiving terminal;
Transmitting terminal, according to the described recipient's window size adjustment send window size determined, carries out flow control by the send window after adjustment.
2. the method for claim 1, is characterized in that, describedly determines recipient's window size according to receive window size and out of order queue size, comprising:
The length of receive window and out of order queue is sued for peace, using summed result as recipient's length of window.
3. method as claimed in claim 2, is characterized in that, described transmitting terminal, according to the described recipient's window size adjustment send window size determined, comprising:
The length sum of described receive window and out of order queue is deducted the length of the result after the length of transmitting terminal retransmission queue as send window by transmitting terminal.
4. the method according to any one of claims 1 to 3, is characterized in that,
Use RUDP (RUDP) to transmit data between described transmitting terminal and receiving terminal, and in RUDP message, increase the field of the size for identifying recipient's window.
5. carry out a transmitting terminal for send window flow control, it is characterized in that, described transmitting terminal comprises: transmitting element, receiving element and window traffic control unit, wherein,
Described transmitting element, for the size to receiving terminal request recipient window while receiving terminal transmission message;
Described receiving element, for receiving recipient's window size from receiving terminal;
Described window traffic control unit, for according to described recipient's window size adjustment send window size, carries out flow control by the send window after adjustment.
6. transmitting terminal as claimed in claim 5, is characterized in that, described window traffic control unit, for adjusting send window size according to described recipient's window size, comprising:
When recipient's window size is the length summation of receive window and out of order queue, the length sum of described receive window and out of order queue is deducted the length of the result after the length of transmitting terminal retransmission queue as send window.
7. the transmitting terminal as described in claim 5 or 6, is characterized in that,
Transmitting terminal uses RUDP (RUDP) to receiving terminal transmission data, and in RUDP message, increase the field of the size for identifying recipient's window.
8. assist a receiving terminal for send window flow control, it is characterized in that, described receiving terminal comprises: receiving element, recipient's window size computing unit, transmitting element, wherein:
Described receiving element, for the request from transmitting terminal receipt message and acquisition recipient window size;
Described recipient's window size computing unit, for determining recipient's window size according to receive window size and out of order queue size;
Described transmitting element, for sending the recipient determined window size to transmitting terminal.
9. receiving terminal as claimed in claim 8, is characterized in that described recipient's window size computing unit, for determining recipient's window size according to receive window size and out of order queue size, comprising:
The length of receive window and out of order queue is sued for peace, using summed result as recipient's length of window.
10. the receiving terminal as described in claim 8 ~ 9, is characterized in that,
Receiving terminal uses RUDP (RUDP) to transmitting terminal transmission data, and in RUDP message, increase the field of the size for identifying recipient's window.
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| CN201410443894.1A CN105376173B (en) | 2014-09-02 | 2014-09-02 | Sending window flow control method and terminal |
| PCT/CN2015/072936 WO2016033948A1 (en) | 2014-09-02 | 2015-02-12 | Transmission window traffic control method and terminal |
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| CN201410443894.1A CN105376173B (en) | 2014-09-02 | 2014-09-02 | Sending window flow control method and terminal |
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| CN107018086A (en) * | 2017-04-24 | 2017-08-04 | 中南大学 | Transfer control method based on packet priority in a kind of data center network |
| CN109525502A (en) * | 2017-09-19 | 2019-03-26 | 宏碁股份有限公司 | The dynamic adjusting method of secure user package agreement device and sliding window parameter |
| CN107708199B (en) * | 2017-09-26 | 2021-01-26 | 南京哈卢信息科技有限公司 | Method for improving downlink reliability of low-power-consumption wireless cellular network |
| CN107708199A (en) * | 2017-09-26 | 2018-02-16 | 南京哈卢信息科技有限公司 | A kind of method for improving the descending reliability of low-consumption wireless Cellular Networks |
| CN109729119A (en) * | 2017-10-30 | 2019-05-07 | 中兴通讯股份有限公司 | A kind of method, apparatus, equipment and the storage medium of coordination data synchrodata |
| CN107819853A (en) * | 2017-11-13 | 2018-03-20 | 中国联合网络通信集团有限公司 | A kind of data transmission method and device |
| CN110830472A (en) * | 2019-11-07 | 2020-02-21 | 西北工业大学 | Flexible data transmission method of flexible data transmission protocol based on TCP/IP protocol |
| CN112994851A (en) * | 2021-01-26 | 2021-06-18 | 中国科学院信息工程研究所 | Method and device for supporting differentiated negotiable parallel data communication |
| CN114449057A (en) * | 2022-01-28 | 2022-05-06 | 北京威视锐科技有限公司 | Data transmission method and device |
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| Publication number | Publication date |
|---|---|
| WO2016033948A1 (en) | 2016-03-10 |
| CN105376173B (en) | 2020-04-28 |
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