CN103873479B - A kind of panel data transmission algorithm assessed based on cross-layer - Google Patents
A kind of panel data transmission algorithm assessed based on cross-layer Download PDFInfo
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Abstract
The present invention proposes a kind of panel data transmission method assessed based on cross-layer, solves the Out-of-sequence packets and the problem that reorders of the initiation due to simple data scheduling in the multidiameter delay transmitting procedure of SCTP.Assessed to obtain accurate path quality, the RTT times are obtained using heartbeat mechanism and judge path activity, the rate estimates value and bandwidth estimation obtained according to the effective signal-to-noise ratio obtained from data link layer and in transport layer is worth to path capacity, and both together decide on path quality.Priority is determined according to path quality, intelligence carries out data distribution scheduling.Judge packet loss reason using path capacity, take different measures to be retransmitted.This method is capable of the double-point information of perception data link layer and transport layer, overcomes the information imperfection of traditional data distribution method, obtains more accurate comprehensively path quality and assesses, carries out efficient data distribution, reduce packet loss and reorder.The reason for triggering packet loss is distinguished simultaneously, it is to avoid the reduction of unnecessary congestion window.By the panel data transmission method assessed based on cross-layer, the dynamic that can be perceived and adapt to wireless network improves Consumer's Experience effect there is provided high-quality data transport service.
Description
Technical field
The present invention relates to communication technique field, communication data transmission technology.Lead to specifically related on SCTP
Cross cross-layer method path quality is estimated and multipath parallel transmission based on path quality realization.
Background technology
With the development of internet and correlation technique, mobile device is intended to the presence of multiple network interfaces, while having more
Strong computing capability, storage capacity and more advanced communication function.In future, network will support multiple network anywhere or anytime
Access, many host (Multihoming) technologies are generally considered can there is provided multiplicity of network using these access devices.This
So that multidiameter delay transmission CMT (Concurrent Multipath Transfer), which turns into, improves the best of performance for wireless communications
Mode.CMT can transmit data using multiple network interface multidiameter delays.Compared with single path, multipath possesses bigger band
Mistake on width, and certain paths can be recovered on another paths.Importantly, transmitting terminal can be in mulitpath
Between carry out data dispatch and congestion balance, the service quality QoS of network service and application is improved to greatest extent.Total comes
Say, in the parallel and distributed of wireless network, CMT possesses preferable aggregated bandwidth ability, fault-tolerance and load balance
Ability.
SCTP SCTP (Stream Control Transmission Protocol) is that IETF is worked out
A kind of transport layer protocol of many host characteristics of new support, can support multiple IP address many to realize simultaneously in same association
Path transmission.Many host characteristics intrinsic SCTP make it have very much prospect in CMT realizations.So far, IETF is in SCTP
Some valuable progress have been achieved on CMT, but also there is many important and full of challenge need of work and have been carried out.
, it is necessary to which emphasis is consideration is that how processing data reorders and packet loss in SCTP CMT.Due to each path parameter exist compared with
Big otherness and dynamic, traditional circulation robin scheduling can trigger caching to block, i.e., occur in extra-heavy caching serious
Out-of-sequence packets receive and reorder.Reordered in order to which how decision-making is distributed data and reduced between multipath, people do
Substantial amounts of work, but most of work are all based on data exchange, the interaction of monitoring transmission-reception or are only by transmission
Connecting quantity on layer.Because the time of Radio Link and frequency variation characteristics will not be reacted directly into transport layer, these mechanism
The information of the wireless connection of acquisition is simultaneously imperfect, thus may be inaccurate.
In addition, because wireless channel is very unreliable, often occur packet loss, and it is mixed with packet rearrangement
Confuse.In wireless environments, packet loss is often caused by wireless mistake, if according to SCTP/TCP original design by it according to gathering around
Plug is inappropriate to handle.If mistakenly repeating transmission window halves algorithm, thus CMT performance can reduce.Therefore, sentence
Other packet loss is because caused by congestion or wireless mistake, it is extremely important then to take different packet loss corresponding measures on earth
's.Clearly as to physical layer and the ignorant of data link layer, transport layer can not accurately judge packet loss reason.
The content of the invention --- claims forms part
In view of this, the present invention proposes a kind of panel data transmission method assessed based on cross-layer, in flow control transmission
In the multidiameter delay transmitting procedure of agreement, according to the information acquisition path quality of transport layer and data link layer, according to path matter
Measuring priority intelligence distribution transmission data, there is provided high performance data transport service.The present invention devises an effective signal-to-noise ratio
Computing module and a speed ＆ Bandwidth estimation module, obtain the information of data link layer and transport layer, employ a base respectively
Judge path quality in the path quality assessment models of cross-layer cooperation, devise a panel data distribution based on path quality
Algorithm carries out data distribution, finally proposes one and perceives re-transmission policy progress retransmission process.The present invention can effectively satisfy the need
Path quality is estimated, and intelligently carries out data distribution scheduling, is adapted to the dynamic of wireless network, is provided effectively for mobile subscriber
Multimedia transmission.
1st, a kind of panel data transmission method assessed based on cross-layer, its step is included：
A) first, path activity judgement is carried out in transport layer, is lived using heartbeat message mechanism HEARTBEAT measuring routes
Dynamic property, judges path activity, is operated in active path；
B) then, for active path, effective signal-to-noise ratio ESNR calculating is carried out in data link layer, to the frame for needing to retransmit
Progress counts to get FER FER, calculates bit error rate BER by FER, is obtained effectively according to the relation of BER and signal to noise ratio snr
Signal to noise ratio ESNR, and periodically reported to transport layer, the cross-layer of realizing route quality is assessed；
C) subsequently, speed ＆ bandwidth estimations are carried out to active path in transport layer, the estimation of passage time average rate is obtained
The occupancy situation of path resources is obtained, passes through real-time bandwidth estimate track path real-time change situation；
D) then, the data link layer week in transport layer designs the panel data distribution policy based on path quality, comprehensive b
The ESNR information of forward exchange report and the speed bandwidth parameter of this Layer Detection in c, realize the dual cognition to path status, solve to pass
Defeated layer caused by data link layer information ignorant to controlling inaccurate problem；By setting up the path quality based on cross-layer cooperation
Assessment models, using cross-layer gain of parameter path residual capacity, set path data to distribute priority, are formed according to path capacity
Path list SL；The panel data distribution algorithms based on path quality are designed, according to path list SL order, successively according to every
The residual capacity of paths distributes appropriate data to each transport layer path, and data total amount is by window limit；
E) finally, re-transmission policy is perceived in transport layer design, packet loss reason is analyzed according to path residual capacity, for by nothing
Packet loss takes different retransmission algorithms respectively caused by line error code and congestion.
2nd, a kind of panel data transmission method assessed based on cross-layer as described in 1, it is characterised in that path activity is sentenced
It is disconnected, including：
A) it is that dynamic estimation interval u is set per paths, comparing u the and RTO times judges path activity；
B) two HEARTBEAT chunks detective paths are sent, if occurring to retransmit and more than maximum retransmission, are set
Path is inactive；If being properly received two ACK, it is movable to set path；Generation retransmits but receives two ACK,
Also allow data distribution even if path to be inactive.
3rd, a kind of panel data transmission method assessed based on cross-layer as described in 1, it is characterised in that effective signal-to-noise ratio
ESNR is calculated, including：
A) on data link level, it would be desirable to which the frame flag of re-transmission is error_frame, and error_frame is counted
Number, by recording the wrong frame of surveying range and the frame of all transmissions, can obtain FER；Obtained using individual bit model by FER
BER, the relation finally according to BER-SNR obtains ESNR.
4th, a kind of panel data transmission method assessed based on cross-layer as described in 1, it is characterised in that speed ＆ bandwidth is estimated
Meter, including：
A) total time of caching is taken using the data volume and these data that are successfully transmitted in estimation interval, is obtained
The average transmission rate R in path in one estimation intervale；When available bandwidth average data packet length and average entrance-leave
Between ratio represent, obtain bandwidth sample using time moving average filter, then be predicted-verified with Kalman filter
Processing, obtains bandwidth estimation value BWe。
5th, a kind of panel data transmission method assessed based on cross-layer as described in 1, it is characterised in that based on path quality
Panel data distribution policy, including：
A) the path quality assessment models based on cross-layer cooperation：It is average to send speed by cross-layer parameter effective signal-to-noise ratio ESNR
Rate ReWith estimation of available bandwidth value BWeCalculating obtains the remaining active volume in path, sets data distribution preferential according to path capacity
Power, forms path list SL；
B) the panel data distribution algorithms based on path quality：According to path list SL order, successively according to every road
The residual capacity in footpath distributes appropriate data, path residual capacity R to pathcFor on the occasion of when, the data volume of distribution can be current
Increase in right amount on the basis of congestion window, conversely, then conservatively distributing data according to window value；The total amount of data is sent by window
Limitation.
6th, a kind of panel data transmission method assessed based on cross-layer as described in 1, it is characterised in that perceive and retransmit plan
Omit, including：
A) when Fast retransmission detects packet loss, transmitting terminal is according to path residual capacity RcPacket loss reason is judged,
It is judged as the caused packet loss of wireless mistake if its value is canonical, only adjusts threshold value；Otherwise it is judged as congestion packet loss, adjusts door
Reduce congestion window while limit value；
B) when Retransmission timeout detects packet loss, congestion window and door are carried out using the SCTP of standard retransmission processing method
Limit value is adjusted.
The present invention has the following technical effect that：
1st, in the present invention, data link layer reports ESNR information to transport layer periodically.ESNR is obtained by FER measurements,
Step simply and conveniently, solve in actual direct SNR measurements disturbed because cochannel can not be handled, signal multichannel shadow
Ring, frequency selective fading and the inaccuracy brought the problem of different frame sign.The ESNR, which gathered, to be wirelessly transferred
Various factors, complicated radio communication is simplified, and can react the route conditions of radio communication to upper strata well.
2nd, in the present invention, transport layer has carried out dual cognition to path status.One is that there is provided a phase for rate estimates
To the average transmission rate value in long-term path, response path occupation condition；One is bandwidth estimation, illustrates every paths
Real-time transmission rate, the real-time change situation of response path.Dual cognition can obtain the clear cognition to path status, for transmission
The decision-making of layer provides effective information.
3rd, in the present invention, using cross-layer parameter effective signal-to-noise ratio ESNR, average transmission rate ReAnd estimation of available bandwidth
Value BWeThe integrated information in path is obtained, path quality is estimated.Cross-layer approach to cooperation can obtain complete wireless connection
Information, provide perfect path quality for panel data distribution algorithms and assess, path is obtained efficient and rational application, reduce
Because of data rearrangement and packet loss caused by improperly data distribution algorithm.
Brief description of the drawings
Fig. 1 is the general frame of panel data transmission algorithm of the present invention；
Fig. 2 is path activity evaluation algorithm flow chart；
Fig. 3 is path bandwidth algorithm for estimating flow chart；
Fig. 4 is data distribution algorithm flow chart；
Fig. 5 is perception re-transmission policy algorithm flow chart；
Embodiment
To readily appreciate technological means, creation characteristic, reached purpose and effect of the present invention, below in conjunction with accompanying drawing and
The present invention will be described in detail for specific embodiment.
1st, overall system architecture figure
In order to solve in SCTP CMT, the data reordering and packet loss problem produced due to the diversity in path, this
Invention proposes a kind of panel data transmission algorithm assessed based on cross-layer.As shown in figure 1, being the overall frame of system of the present invention
Multipath on frame, including transmitting terminal, receiving terminal and wireless network.SCTP receiving terminals receive the data sent from transmitting terminal, so
Feedback reception state afterwards.SCTP transmitting terminals collect feedback, state and the information acquisition path of data link layer by transport layer
Quality, according to path quality distribution transmission data.
Cross-layer assessment models utilize effective signal-to-noise ratio ESNR, and rate estimates value and bandwidth estimation value judge path capacity,
Send HEARTBEAT and judge path activity, both constitute path quality.Panel data distribution scheduling utilizes cross-layer assessment models
The parameter of acquisition, carries out sequentially and by volume data distribution.Packet loss is handled by perception re-transmission policy.
2nd, path activity judges
In cross-layer cooperation, matter of utmost importance is to need how long to calculate an ESNR and update path quality.For every paths
There is provided a dynamic estimation interval u.When occurring packet loss, an interval sample x is obtained using confidential intervalk。
WhereinFor average value, σ is standard deviation, Z1-ε/2For a ε function, completed when previous estimation interval
When, choose the value that lower bound updates u.
Estimation interval is relevant with path activity：Update after u, if certain paths has u≤RTO, i.e., often lose
The path, then be set to inactive by bag；Otherwise, path is set to activity.Both states and the definition in standard SCTP
Equally.
But, this algorithm has weak point.Because u is a statistical result based on historical sample, transmitting terminal can only
Know the long-term behaviour in path.If path burst fluctuation, it is impossible to ensure this path activity performance promptly change data point
Hair.Furthermore, SCTP CMT allow to reply SACK on other path, and traditional RTT metering systems may bring mistake
Delay Estima-tion, thus cannot be used for the assessment of path quality.Herein, we do not use DATA chunks RTT measurement sides
Formula.Because HEARTBEAT_ACK must be replied with HEARTBEAT identicals path, we extract HEATBEAT chunks
The RTT times as with reference to RTT be RTTref。
In order to obtain accurate path activity and RTTref, SCTP fixation HEARTBEAT intervals are changed to dynamic by us
U.In the beginning of each estimation interval, transmitting terminal sends two HEARTBEAT chunks and carrys out detective path.If at one
Corresponding two HEARTBEAT_ACK have been replied in path in the RTO times, error counter are just removed, even if now u≤RTO
Path, which is put, can distribute data.Otherwise, error counter is counted, while retransmitting HEARTBEAT.When counter is reached
During Path.Max.Retrans, path is set to inactive.When transmitting terminal is successfully received two HEARTBEAT_ACK,
Access time shorter RTT is used as RTTref.Finally, we can obtain the available active path of n bars, all inactive roads
Footpath must not all participate in process below.
Fig. 2 is the flow chart of the algorithm, and its step is as follows：
1) path activity is judged according to u：If u≤RTO, path is set to inactive, active is otherwise set to.
2) two HEARTBEATS are sent, two HEARTBEATS timer is respectively started, path is set to inseparable
With data, record is properly received the counter HBcount zero setting of HEARTBEAT_ACK number.
If 3) counter HBcount value is less than 2, step 4 is carried out, otherwise, step 6 is gone to.
4) for the HEARTBEATS of each transmission, if being successfully received HEARTBEAT_ACK, RTT times, meter are recorded
Number device HBcount adds 1, and stops corresponding timer；If timer expired, re-transmission HEARTBEAT, timer reclocking,
Time-out counter error adds 1.
If 5) counter error value is more than path maximum retransmission, path is set to inactive, is transferred to step
6.Otherwise step 3 is returned to.
If 6) counter HBcount value is 2, that is, two HEARTBEAT_ACK are properly received, carry out step 7, otherwise
Algorithm terminates.
7) if now path status is non-movable and the value of error counters is 0, i.e., do not occur
HEARTBEAT time-out, then be changed to activity by path status.
8) data can be distributed by being set to path, and time-out counter error is reset, and it is RTT to select the shorter RTT timesref。
Algorithm terminates.
3rd, effective signal-to-noise ratio ESNR is calculated
Due to different types of noise, decline and interference, wireless channel has unpredictability and unreliability.Generally,
SNR can provide the comprehensive assessment of a radio communication.But in actual SNR measurements, existing equipment is all only in physics
The PLCP of layer preamble and head measurement, the higher data frame of speed is not considered.Furthermore, this SNR directly reported is not
Cochannel interference, the influence of signal multichannel, frequency selective fading and different frame signs can be handled.So we take ESNR's general
Read to solve directly report SNR deficiency.
There is the one-one relationship of knowable determination in specific radio communication, between BER and SNR.Assuming that working as front ring
In border, BER=F (SNR), then ESNR is defined as：
ESNR=F-1(BER) (3)
Calculating SNR can switch to measure BER.BER direct measurement can bring very large overhead in physical layer, so Selection utilization
The FER of data link layer calculates BER.In an estimation interval u, the frame and FER for recording transmission are very convenient.In number
Just it is error_frame by this frame flag once a data frame requires to retransmit according on link layer.By recording error_
Frame and the frame of all transmissions, can obtain FER：
Herein, error_frame_num is the quantity of error_frame in an estimation interval, total_frame_
Num is the quantity of the frame sent altogether in an estimation interval.If the FER=0 in path, then the FER in the path is set to
Rational minimum value.When all bits of an and if only if frame are all successfully decoded, a frame is just properly received, so, BER
It can be obtained by following formula：
Herein, L is the byte number of a data frame.Again by formula (3), it can calculate and obtain ESNR.
4th, speed ＆ bandwidth estimations
When carrying out the processing of SCTP data exchanges, there are some data transmitting and occupying path resources.We
The occupancy situation of system path resource is informed using a time mean speed estimation.Define ReFor in an estimation interval
The average transmission rate in path：
Herein, sendsize is the data volume being successfully transmitted in estimation interval, TeIt is that first data enters road
The time of footpath caching, TlIt is the time that last data leaves caching.
The viewpoint of bandwidth estimation is changed into transmission duration, i.e.,：Available bandwidth is equal to average data packet length and averagely entered
Enter-the ratio of time departure.Fluctuated to eliminate caused by random transmission behavior, bandwidth sample must first pass through time average filter
Device does smoothing processing.Kalman filter is recycled to obtain bandwidth estimation value.Kalman filter is a discrete time recurrence
Wave filter, carries out time renewal, passes through the current bandwidth status of former prediction of result first；Renewal is measured again, will be new
Sample bring prior estimate into, obtain Posterior estimator.
As shown in figure 3, the algorithm flow estimated for path bandwidth：
1) data length sample and time samples are obtained.
2) data are sent.Record sends the time of final data.
3) mean data length and average length of time are updated, calculating obtains bandwidth sample.
4) time renewal is carried out, the priori estimates of bandwidth and error variance are obtained.
5) renewal is measured, the posterior estimate of bandwidth and error variance is obtained according to bandwidth sample.
5th, the panel data distribution policy based on path quality
A) the path quality assessment models based on cross-layer cooperation
Selection distributes data in another cycle dynamics.So, cross-layer is assessed and data distribution can be carried out simultaneously
But combined with different steps.Distribution cycle PdWith the disposal ability dynamical correlation in each path.The processing time of one paths is：
In order to make full use of all active paths, PdThe processing time of maximum can be selected：
Afterwards, data will be in PdIt is distributed to simultaneously in all path candidates in time.In fixed environment, distribute frequency
For：
Path capacity C can be obtained by cross-layer mode：
C=BWe·log2(1+ESNR) (9)
Due to the occupied R of pathse, the residual capacity R in the pathcFor：
Rc=C-Re (10)
Then, by all path candidates according to RcDescending is arranged, and forms new and classification a path list SL.This
So that RcLarger path has the higher-priority of data distribution.
P is spaced in distributiondIn, the data volume D that maximum can distributemaxLimited by following formula：
B) the panel data distribution algorithms based on path quality
According to SL queue sequence, successively according to the R per pathscDistribute appropriate data to path.If RcFor just
Value, represents that there is potential disposal ability in the path to increase its handling capacity, the data volume of distribution is current cwnd and added
Rc.Otherwise, the difference that only conservatively distribution data are cwnd and outstanding.In cycle PdIn, as long as cwnd allows, point
The data volume D of hair can move closer to Dmax.If data distribution amount has reached Dmax, then the data distribution times in the cycle is completed
Business simultaneously stops data distribution immediately.The end cycle is waited, then recalculates ThandleWith next Pd.Update C and Rc, next
Individual PdRepeating algorithm continues the distribution of data.
As shown in figure 4, being the flow of data distribution algorithm：
1) for path i in list SL, if RcMore than zero, then distribution data volume D is set by formula (11), otherwise, according to
Data volume is distributed in formula (12) setting：
2) the data D distributed is calculatedtotal=Dtotal+i.D。
If 3) Dtotal≤Dmax, distribute data i.D on the i of path when cwnd allows；If Dtotal>Dmax, then stop
Data distribution, waits next data distribution time.
4) for next paths, repeat step 1-3, until distributing all paths.
6th, re-transmission policy is perceived
, can be according to R if there occurs packet loss in data exchangecThe reason for analysis causes packet loss.And use different steps
It is rapid to recover packet loss.
When Fast retransmission detects packet loss, transmitting terminal can be judged packet loss reason：If Rc＞ 0 then represents the road
Footpath is not reaching to Congestion Level SPCC, and packet loss is attributed into wireless error code, adjusts ssthresh but does not adjust cwnd：
Ssthresh=max (Re·RTTref,cwnd/2,4·MTU) (13)
Wherein ReIt is the result of rate estimates, RTTrefPreviously described reference RTT.We use the speed in cycle
Rate estimate is random and burst because of wireless error code, and its adjustment needs to come back to average level.Conversely, Rc＜ 0, road
Packet loss is attributed to congestion, cwnd is adjusted while adjustment ssthresh by footpath by excessive use:
Ssthresh=max (BWe·RTTref,cwnd/2,4·MTU) (14)
Cwnd=min (cwnd, ssthresh) (15)
Wherein BWeFor bandwidth estimation value.We are because congestion represents connection essence using real-time bandwidth estimation value
On change.
For Retransmission timeout, because RTO is a relatively long time, the time-out of T3-rtx timers is tight predictive of having
The congestion or wireless mistake of weight, we only conservatively use standard SCTP treating method.
After adjustment, selection possesses maximum cwnd path and retransmits the packet of loss as quickly as possible.Fig. 5 is re-transmission
The flow of algorithm.
Claims (6)
1. a kind of panel data transmission method assessed based on cross-layer, its step is included：
A) first, path activity judgement is carried out in transport layer, utilizes heartbeat message mechanism HEARTBEAT measuring route activities
Property, judge path activity, operated in active path；
B) then, for active path, effective signal-to-noise ratio ESNR calculating is carried out in data link layer, the frame for needing to retransmit is carried out
FER FER is counted to get, bit error rate BER is calculated by FER, effective noise is obtained according to BER and signal to noise ratio snr relation
Reported than ESNR, and periodically to transport layer, the cross-layer of realizing route quality is assessed；
C) subsequently, speed ＆ bandwidth estimations are carried out to active path in transport layer, the estimation of passage time average rate obtains road
The occupancy situation of footpath resource, passes through real-time bandwidth estimate track path real-time change situation；
D) then, all forward exchanges of data link layer in transport layer designs the panel data distribution policy based on path quality, comprehensive b
The ESNR information of report and the speed bandwidth parameter of this Layer Detection in c, realize the dual cognition to path status, solve transport layer
To controlling inaccurate problem caused by data link layer information ignorant；Assessed by setting up the path quality based on cross-layer cooperation
Model, using cross-layer gain of parameter path residual capacity, sets path data to distribute priority, forms path according to path capacity
List SL；The panel data distribution algorithms based on path quality are designed, according to path list SL order, successively according to every road
The residual capacity in footpath distributes appropriate data to each transport layer path, and data total amount is by window limit；
E) finally, re-transmission policy is perceived in transport layer design, packet loss reason is analyzed according to path residual capacity, for by wirelessly missing
Code and packet loss caused by congestion take different retransmission algorithms respectively.
2. a kind of panel data transmission method assessed based on cross-layer as claimed in claim 1, it is characterised in that path activity
Property judge, including：
A) it is that dynamic estimation interval u is set per paths, comparing u the and RTO times judges path activity；
B) two HEARTBEAT chunks detective paths are sent, if occurring to retransmit and more than maximum retransmission, path is set
To be inactive；If being properly received two ACK, it is movable to set path；Generation retransmits but receives two ACK, even if
Path also allows data distribution to be inactive.
3. a kind of panel data transmission method assessed based on cross-layer as claimed in claim 1, it is characterised in that effective noise
Calculated than ESNR, including：
A) on data link level, it would be desirable to which the frame flag of re-transmission is error_frame, and error_frame is counted, lead to
The wrong frame of overwriting surveying range and the frame of all transmissions, can obtain FER；BER is obtained by FER using individual bit model,
Relation finally according to BER-SNR obtains ESNR.
4. a kind of panel data transmission method assessed based on cross-layer as claimed in claim 1, it is characterised in that speed ＆ bands
Width estimation, including：
A) total time of caching is taken using the data volume and these data that are successfully transmitted in estimation interval, is obtained at one
The average transmission rate R in path in estimation intervale；Available bandwidth average data packet length and average entrance-time departure
Ratio represented, bandwidth sample is obtained using time moving average filter, then be predicted with Kalman filter-verification at
Reason, obtains bandwidth estimation value BWe。
5. a kind of panel data transmission method assessed based on cross-layer as claimed in claim 1, it is characterised in that based on path
The panel data distribution policy of quality, including：
A) the path quality assessment models based on cross-layer cooperation：By cross-layer parameter effective signal-to-noise ratio ESNR, average transmission rate ReWith
Estimation of available bandwidth value BWeCalculating obtains the remaining active volume in path, sets data distribution priority according to path capacity, is formed
Path list SL；
B) the panel data distribution algorithms based on path quality：According to path list SL order, successively according to every paths
Residual capacity distributes appropriate data, path residual capacity R to pathcFor on the occasion of when, the data volume of distribution can be in current congestion
Increase in right amount on the basis of window, conversely, then conservatively distributing data according to window value；The total amount for sending data is limited by window
System.
6. a kind of panel data transmission method assessed based on cross-layer as claimed in claim 1, it is characterised in that perceive and retransmit
Strategy, including：
A) when Fast retransmission detects packet loss, transmitting terminal is according to path residual capacity RcPacket loss reason is judged, if its value
It is judged as the caused packet loss of wireless mistake for canonical, only adjusts threshold value；Otherwise it is judged as congestion packet loss, adjustment threshold value
Reduce congestion window simultaneously；
B) when Retransmission timeout detects packet loss, congestion window and threshold value are carried out using the SCTP of standard retransmission processing method
Adjustment.
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| CN104994036B (en) * | 2015-06-09 | 2018-04-24 | 北京邮电大学 | A kind of dynamic data dispatching method in multi-path transmission protocol |
| CN105187277A (en) * | 2015-09-14 | 2015-12-23 | 江西师范大学 | SACK loss detection and rapid retransmission method based on wireless network error perception |
| CN110521178B (en) | 2017-05-22 | 2021-03-30 | 华为技术有限公司 | Method, device and system for distributing data |
| CN107302504B (en) * | 2017-07-07 | 2020-01-14 | 北京邮电大学 | Multipath transmission scheduling method and system based on virtual sending queue |
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