CN103763211B - Link flow control method - Google Patents
Link flow control method Download PDFInfo
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- CN103763211B CN103763211B CN201410049558.9A CN201410049558A CN103763211B CN 103763211 B CN103763211 B CN 103763211B CN 201410049558 A CN201410049558 A CN 201410049558A CN 103763211 B CN103763211 B CN 103763211B
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Abstract
The invention provides a link flow control method which is based on an IP OVER CCSDS high-speed communication processor. The high-speed communication processor has five links of data injection, the data injection rates of four links are relatively fixed, and only the injection rate of the other one link of data, namely load data, is largely changed. When a total input bandwidth of the high-speed communication processor is larger than (or smaller than) an output bandwidth, the link with large data injection rate changes enables received data to be temporarily stored in a buffer device, and the data volume of the data extracted from the buffer device is adjusted through using information and dispatching information according to the current link. The data volume extracted from the buffer device is adjusted to avoid overflowing of a large number of data, and the handling capacity of the high-speed communication processor is improved.
Description
Technical field
The present invention relates to Aero-Space field of flow control, particularly to a kind of link flow control method.
Background technology
With the development of space technology, space communication is no longer the propagation of simple telecommand.Communication complexity increases
Plus, data stream transmitting mode increases, the factor such as spacecraft increasing number exacerbates to data volumes such as video, audio frequency, load datas
The greatly transmission demand of spatial data.The research of this respect is concentrated mainly on the design of AOS combiner, combining at this stage at present
The development of device is a starting stage, and it is single that interface is simulated；System structure miniaturization and modularity；Key technology simple
Change.The domestic research level for AOS combiner is in the extension to data source.
For the spatial data that data volume is larger, typically take and the data receiving is stored temporarily in a buffer memory device
In, when suitable, data in buffer memory device is taken out and be transmitted again.Relate to link flow in this process
System strategy.
Content of the invention
It is an object of the invention to provide a kind of link flow control method, by the statistics to link information, and carry out phase
Link urgency should be calculated, dynamically adjust transmission window further according to link circuit condition, transmission window size and link urgency
Size.Improve the handling capacity of communication processor under the situation ensureing not spilling over, reduce transmission delay.
The present invention provides a kind of link flow control method, based on IP OVER CCSDS high-speed communication processor, including：
Behaviour in service is cached according to current time link and scheduled situation obtains link urgency；
Behaviour in service is cached according to current time link and link urgency obtains the size that subsequent time sends window；
Receive the size that described subsequent time sends window, and send data by described transmission window size.
Further, in described link flow control method, described link flow control method only controls a road link.
Further, in described link flow control method, behaviour in service is being cached according to current time link and is being adjusted
In the step of degree situation acquisition link urgency, link urgency is obtained by below equation：
Wherein, ω is current time link caching behaviour in service and is scheduled
Rate of specific gravity between situation；S is scheduled number of times, SmaxIt is maximum scheduled number of times in one section of moment, B is
Current time link caches behaviour in service；BmaxIt is that in one section of moment, link caches total carrying capacity.
Further, it is characterised in that described cache according to current time link in described link flow control method
Also include before the step of size of behaviour in service and link urgency acquisition subsequent time link transmission window：
Setting current time link sends the size of window；
Cache the surplus of behaviour in service when the size that described current time link sends window is more than described current time link
The size of window during complementary space, is sent by the described current time link of link urgency adjustment；Adjustment is up to described current time
When the size of link transmission window is less than the remaining space that described current time link caches behaviour in service, amplify system by default
Number increases the size that current time link sends window；
When the size of the transmission window after described growth is more than default window maximum, adjusts by link urgency and increase
The size of the transmission window after length；Adjustment is until the size sending window after described growth is less than default window maximum
When, increase the size of the transmission window after adjustment.
Further, in described link flow control method, send the size of window in setting current time link
In step, the size that current time link sends window is arranged by below equation：SW (t)=2t, wherein SW (t) expression is currently
Moment sends the size of window.
Further, in described link flow control method, adjusting described current time link by link urgency
Send in the step of size of window and the size that described current time link sends window is adjusted by below equation：SW (t)=λ
SW (t-1), wherein, λ represents link urgency, and SW (t-1) represented that a upper moment sent the size of window.
Further, in described link flow control method, increasing current time link by default amplification coefficient
Send in the step of size of window and the size that current time link sends window is increased by below equation：SW (t)=SW
(tm)+αλ(t-tm), wherein, SW (tm) represent that the size of current time link transmission window is more than current time link caching and makes
With the moment of the remaining space of situation, α represents default amplification coefficient.
Further, in described link flow control method, the step of the size of transmission window after increasing adjustment
In by below equation increase adjustment after transmission window size：
A kind of link flow control method that the present invention provides, has the advantages that：The present invention is according to current time chain
Road caching behaviour in service, scheduled situation and link urgency carry out real-time adjustment to sending window, it is to avoid data a large amount of
Overflow, also improve the handling capacity of high-speed communication processor.
Brief description
Fig. 1 is the link flow control method schematic diagram of the embodiment of the present invention；
Fig. 2 is the window control schematic diagram of the link flow control method of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, link flow control method proposed by the present invention is described in further detail.
According to following explanation and claims, advantages and features of the invention will become apparent from.It should be noted that, accompanying drawing is all using very
The form that simplifies and all using non-accurately ratio, only in order to purpose that is convenient, lucidly aiding in illustrating the embodiment of the present invention.
The invention provides a kind of link flow control method, based on IP OVER CCSDS high-speed communication processor, logical at a high speed
Letter processor one has five circuit-switched data injections, and wherein four circuit-switched data charge velocities are more fixing, only one circuit-switched data, i.e. charge number
According to charge velocity change greatly.When the total input tape of high-speed communication processor is wider than（Or it is less than）During output bandwidth, number
According to the link that charge velocity changes greatly, the data receiving is stored temporarily in a buffer memory device, further according to current chain
Road, extracts the data volume of data using use information and schedule information adjustment from buffer memory device.Carried from buffer memory device by adjustment
The data volume taking avoids a large amount of spillings of data, also improves the handling capacity of high-speed communication processor.
Refer to Fig. 1, it is the link flow control method schematic diagram of the embodiment of the present invention.As shown in figure 1, the present invention provides
A kind of link flow control method, based on IP OVER CCSDS high-speed communication processor, including：
S11：Urgency computing module caches behaviour in service according to current time link and scheduled situation acquisition link is tight
Anxious degree；
Specifically, link urgency is obtained by below equation：Wherein, ω is current
Moment link caches the rate of specific gravity between behaviour in service and scheduled situation, and in the present embodiment, ω chooses between 0 and 1, but
Depending on ω is according to specific task in practice, and there is an optimized value, data transmission performance can be made to reach
Good；S is scheduled number of times, SmaxIt is maximum scheduled number of times in one section of moment, B is that current time link caching uses shape
Condition；BmaxIt is that in one section of moment, link caches total carrying capacity.
S12：Window controlling module caches behaviour in service according to current time link and link urgency obtains subsequent time
Send the size of window；
S13：Memory space receives the size that described subsequent time sends window, and sends number by described transmission window size
According to.
Preferably, as can be seen from Figure 1 this link flow control method only controls a road link, i.e. link 1.
Refer to Fig. 2, it is the window control schematic diagram of the link flow control method of the embodiment of the present invention.As Fig. 2 institute
Show, concrete steps include：
S21：Setting current time link sends the size of window；
In original state, the size of window is 0.In order to quickly start up, window can be allowed to be rapidly achieved to be needed
The window size asked, then allow the window size of this situation be multiplied by 2 be the truth of a matter exponential increase, growth formula is：SW (t)=
2t, the size of wherein SW (t) expression current time transmission window.Growth can continue always and reach regulation until the size of window
The insufficient memory of window maximum or link is used.
S22：Cache behaviour in service when the size that described current time link sends window is more than described current time link
Remaining space when, send the size of window by the link urgency described current time link of adjustment；Adjustment is until described current
When the size of moment link transmission window is less than the remaining space that described current time link caches behaviour in service, put by default
Big coefficient increases the size that current time link sends window；
Specifically, the size that described current time link sends window is adjusted by below equation：SW (t)=λ SW (t-
1), wherein, λ represents link urgency, and SW (t-1) represented that a upper moment sent the size of window.The adjustment of window size and chain
The value of road urgency is closely coupled, if the value of link urgency is little illustrates that the demand of now link pair data is smaller, window
Size is adjusted can become less.If the value of link urgency is larger, illustrate that demand data is big, window size is through toning
Whole can become larger.Can be using memory space if being also greater than link through window adjustment window size, this state continues to hold
OK, conversely, then pressing default amplification coefficient to increase the size that current time link sends window.
Specifically, the size that current time link sends window is increased by below equation：SW (t)=SW (tm)+αλ(t-
tm), wherein, SW (tm) represent that current time link sends size the remaining more than current time link caching behaviour in service of window
In the moment of complementary space, α represents default amplification coefficient.Due to link can using memory space inadequate although through one wheel window
Mouth size adjustment, link space is likely to or faces the situation of deficiency, so window now is obeyed one and more slowly increased
Long mode.From formula as can be seen that increasing is the linear growth of a class and related to link urgency.
S23：When the size of the transmission window after described growth is more than default window maximum, adjust by link urgency
The size of the transmission window after whole growth；Adjustment is maximum less than default window up to the size of the transmission window after described growth
During value, increase the size of the transmission window after adjustment.
Specifically, in the window build phase through beginning state, if window size has reached the window setting
Big value then needs to carry out the window size adjustment of a wheel.Set up window maximum be according to engineering demand depending on.The step for
Adjustment window operation is as previous step adjustment window.But the growth pattern after adjustment is very different.
Specifically, after being adjusted window, state can be leapt to window and increase state.Increased by below equation and adjust
The size of the transmission window after whole：Improve window by increasing the variable of an exponential increase
Size.This growth pattern is apparently higher than the growth pattern of the window growth of previous step.This state is due to before
Reach the maximum that window specifies, through the window size adjustment of a wheel, the in general demand of now link pair data
Also very big, so window will be increased as soon as possible to transmit mass data.
Base this, the present invention caches behaviour in service, scheduled situation and link urgency to transmission according to current time link
Window carries out real-time adjustment, it is to avoid a large amount of spillings of data, also improves the handling capacity of high-speed communication processor.
Foregoing description is only the description to present pre-ferred embodiments, not any restriction to the scope of the invention, this
Any change that the those of ordinary skill in bright field does according to the disclosure above content, modification, belong to the protection of claims
Scope.
Claims (7)
1. a kind of link flow control method, based on IP OVER CCSDS high-speed communication processor it is characterised in that including：
Behaviour in service is cached according to current time link and scheduled situation obtains link urgency；
Behaviour in service is cached according to current time link and link urgency obtains the size that subsequent time sends window；
Receive the size that described subsequent time sends window, and send data by described transmission window size；
Wherein, described behaviour in service and link urgency cached according to current time link obtain subsequent time link send window
The step of size before also include：
Setting current time link sends the size of window；
Cache the remaining empty of behaviour in service when the size that described current time link sends window is more than described current time link
Between when, send the size of window by the link urgency described current time link of adjustment；Adjustment is up to described current time link
When the size of transmission window is less than the remaining space that described current time link caches behaviour in service, increase by default amplification coefficient
Long current time link sends the size of window；
When the size of the transmission window after described growth is more than default window maximum, after increasing by the adjustment of link urgency
Transmission window size；Adjustment is until when the size sending window after described growth is less than default window maximum, increase
The size of the transmission window after long adjustment.
2. link flow control method as claimed in claim 1 is it is characterised in that described link flow control method only controls a road
Link.
3. link flow control method as claimed in claim 1 is it is characterised in that using shape according to current time link caching
In the step of condition and scheduled situation acquisition link urgency, link urgency is obtained by below equation：Wherein, ω is the proportion that current time link caches between behaviour in service and scheduled situation
Value；S is scheduled number of times, SmaxIt is maximum scheduled number of times in one section of moment, B is that current time link caching uses shape
Condition；BmaxIt is that in one section of moment, link caches total carrying capacity.
4. link flow control method as claimed in claim 1 is it is characterised in that send window in setting current time link
In the step of size, the size that current time link sends window is arranged by below equation：SW (t)=2t, wherein SW (t) table
Show that current time sends the size of window.
5. link flow control method as claimed in claim 1 it is characterised in that by link urgency adjustment described current when
In the step of size carving link transmission window, the size that described current time link sends window is adjusted by below equation：SW
T ()=λ SW (t-1), wherein, λ represents link urgency, and SW (t-1) represented that a upper moment sent the size of window.
6. link flow control method as claimed in claim 5 it is characterised in that by default amplification coefficient increase current when
In the step of size carving link transmission window, the size that current time link sends window is increased by below equation：SW(t)
=SW (tm)+αλ(t-tm), wherein, SW (tm) represent that the size of current time link transmission window is more than current time link and delays
Deposit the remaining space of behaviour in service, α represents default amplification coefficient.
7. link flow control method as claimed in claim 1 is it is characterised in that increasing the size sending window after adjusting
Step in by below equation increase adjustment after transmission window size：Wherein,
SW(tm) represent that current time link sends the remaining space more than current time link caching behaviour in service for the size of window,Represent the variable of exponential increase.
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| CN201410049558.9A CN103763211B (en) | 2014-02-13 | 2014-02-13 | Link flow control method |
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| CN201410049558.9A CN103763211B (en) | 2014-02-13 | 2014-02-13 | Link flow control method |
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| CN1992582A (en) * | 2005-12-31 | 2007-07-04 | 中兴通讯股份有限公司 | Implementation method for adaptive variable slide receiving window of broadband signaling link |
| CN101170504A (en) * | 2007-12-03 | 2008-04-30 | 北京天碁科技有限公司 | Adjustment method for window traffic of radio link control layer |
| CN101175027A (en) * | 2006-10-31 | 2008-05-07 | 中兴通讯股份有限公司 | SSCOP periodic line sliding window updating method |
| US8159939B1 (en) * | 2009-05-08 | 2012-04-17 | Adobe Systems Incorporated | Dynamic network congestion control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7421502B2 (en) * | 2002-12-06 | 2008-09-02 | International Business Machines Corporation | Method and system for storage-aware flow resource management |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1992582A (en) * | 2005-12-31 | 2007-07-04 | 中兴通讯股份有限公司 | Implementation method for adaptive variable slide receiving window of broadband signaling link |
| CN101175027A (en) * | 2006-10-31 | 2008-05-07 | 中兴通讯股份有限公司 | SSCOP periodic line sliding window updating method |
| CN101170504A (en) * | 2007-12-03 | 2008-04-30 | 北京天碁科技有限公司 | Adjustment method for window traffic of radio link control layer |
| US8159939B1 (en) * | 2009-05-08 | 2012-04-17 | Adobe Systems Incorporated | Dynamic network congestion control |
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