CN103825775B - The multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length - Google Patents
The multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length Download PDFInfo
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Abstract
The invention discloses the multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length, the method sends a packet string from source host to destination host, the delay time signal returned according to tested node determines the available bandwidth value B that the position of bottleneck link and estimate, then reset the lifetime value of bag string, bag string length is adjusted simultaneously, and after measuring every time, the Delay for receiving is fed back to source host by measured node.Source host according to feedback information adjust bag string in packet length and observe it is each bag string return Delay judge obtain actual available bandwidth.Present invention achieves the real-time monitoring to wireless network bandwidth, not only increases the precision of the measured value of wireless network available bandwidth, moreover it is possible to improve multi-hop wireless network reliability, the load of network is reduced, improves the performance of network.
Description
Technical field
The present invention relates to a kind of available bandwidth real-time detection mechanism, and in particular to the jump wireless network of self-adaptive detection bag length
Available bandwidth real-time detection method.
Background technology
How in the wireless network extensive with wireless network is applied and rapid growth of the mankind to information service demand,
The service quality (QoS) of guarantee business becomes the hot issue studied a few days ago, and the acquisition of available bandwidth is wireless network
One important prerequisite of middle guaranteed qos (quality of service).Network measure is High Performance Protocol design, the network equipment
Exploitation, the network planning and construction, the basis of network management and operation, while and developing the basis of high-effect network application.With
Being continuously increased for the new business such as real time business and multimedia application, service quality of the people to network（QoS）Propose higher
Requirement.Although network backbone bandwidth and access bandwidth are multiplied, network performance does not obtain lifting at double, its
Main cause is the problem of network capacity design, Internet resources distribution and Application Design.The purpose of network bandwidth measurement is accurate
The bottleneck link found in network（Tight link, the minimum link of available bandwidth）It is located, so as to for network-wide basis
Network capacity planning provides foundation, it can be seen that bandwidth measurement occupies critical role in network measure.
The measuring method of the network bandwidth mainly has actively measurement and passive measurement, and active measuring method is surveyed by actively sending
Try bag to obtain network bandwidth measurement value, passive measurement method obtains network bandwidth survey by analyzing data flow present in network
Amount data.
The content of the invention
The present invention is directed to the deficiencies in the prior art, there is provided a kind of multi-hop wireless network available bandwidth of self-adaptive detection bag length
Real-time detection method.The present invention can not only realize the real-time monitoring to wireless network bandwidth, moreover it is possible to improve wireless network and can use
The precision of the measured value of bandwidth, improves multi-hop wireless network reliability, improves the performance of network.
The technical scheme is that：The multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length,
It is characterized in that comprising the steps：
(1) burst of data bag string is sent from source host S to destination host D, it is true according to the delay time signal that tested node is returned
The available bandwidth value B that the position for determining bottleneck link and one estimate.
(2) data of the bottleneck link position obtained by step (1), reset the Lifetime values of packet string
So that bag string is navigated on bottleneck link, at the same the length wrapped in adjusting bag string, the available bandwidth value B measured by step (1),
Between [B-m, B+m], m takes the 10% ~ 20% of available bandwidth B to the exact value of prediction actual available bandwidth, wraps long first time and adjusts
Two bounds of whole reference actual available bandwidth value B ± m, using the bound of actual available bandwidth, it is determined that the long adjustment of bag
Scope, the higher limit with B+m as available bandwidth is given out a contract for a project or the lower limit with B-m as available bandwidth is given out a contract for a project for the first time, and two kinds are given out a contract for a project
Principle it is identical, the method for the long adjustment of bag needs to make to change, and need to only change bag length, send the bag string after adjustment, and be separated by often
t1Time repeats to send once, sends k time, and k takes 3-5, to be averaging；
(3) after measuring every time, the Delay for receiving is fed back to source host by measured node, and source host is according to feedback
The length of packet and observe the Delay that each bag string returns and judge this measurement whether success in information adjustment bag string, when
The scope for obtaining the actual available bandwidth of last time measurement is [B-m, B+m], then understand that the long L of adjustment bag makes (y by step (2)j×
Bi top)=B+m, y in formulajCorresponding adjustment factor when representing that the long L adjustment jth of bag is secondary, Bi topRepresent i-th node-routing maximum
Transmission rate, sends the bag after adjustment and goes here and there and measure, and when the time delay monotone increasing for observing that bag string is returned, is then judged as successfully,
Otherwise, it is judged as unsuccessful；
When being judged as successfully, then bag length repeat step (2), (3) of bag string are readjusted, the time delay of k bag string is counted
dk, D (d1,d2,...,dk) be k time of same L-value bag string time delay variance, as D (d1,d2,...,dkDuring)≤Δ d, obtain
Actual available bandwidth B*=(Bi top)2/(n×L/t1 +B1 top)；
It is unsuccessful when judging, then the value of m is increased into Δ m, Δ m=(5% ~ 10%) × m on the basis of its original, specifically
Value determine that by network condition, when network condition is good, Δ m takes 10%, when network condition is poor, and Δ m takes 5%, repeat step
(2), (3), when judging still as unsuccessful, then return to step (1) is remeasured.
Further, the bag in described bag string is all UDP packet, and the bag is made up of two parts,
A part is measurement data bag, for positioning bottleneck link；Another part is load data bag, for the measurement of available bandwidth,
Measurement data bag is symmetrically dispersed in load data bag both sides, and the Lifetime values of the measurement data bag of head increase successively from 1,
Increase to how many according to path node decision, the Lifetime values of the measurement data bag of afterbody are decremented to 1 successively.
Further, the Lifetime values foundation that measurement data Bao Gebao is reset in step (2) is to make life cycle
Value progressively increases to i from 1, uses t1Represent the time interval between bag string, t2Represent a branch of bag string by first node router
Taken time, Bi topI-th node router maximum transmission rate (i=1,2,3......) is represented, it is known, yjRepresent
Corresponding adjustment factor when wrapping long L adjustment jth time, wherein 0<yj<1, n and L represents load data bag in a branch of bag string respectively
The length of number and each bag, according to t1 / (t1+t2) × B1 top = (yj×Bi top)(formula 1.1), t2 = n×L/B1 top
(formula 1.2), can obtain y by formula 1.1 and 1.2j=t1×(B1 top)2/(t1×B1 top×Bi top+n×Bi top× L) (formula
1.3), after, setting n, adjusting L according to formula 1.3 can make (yj×Bi top)=B ± m, when equation is set up, resulting L-value seeks to
The numerical value of adjustment.
Further, according to the Delay fed back in step (3) and whether successfully, judge the scope of available bandwidth
Concrete grammar be：
When adjustment L makes (yj×Bi top)=B+m, and the delay time signal for obtaining is monotone increasing, that is, measure successfully, then judging can
(y is less than with bandwidthj×Bi top), just increasing L-value in measurement next time makes (yj+1×Bi top) reduce, so as to reduce actual available band
Wide scope, concrete grammar are increasing L-value, to make (y using formula 1.3j+1×Bi top) be reduced to that last time measurement obtains it is available
The intermediate value of bandwidth range；
When in measurement next time, time delay monotone increasing explanation available bandwidth is less than (yj+1×Bi top), then available bandwidth scope
In [B-m, (yj+1×Bi top)];
When in measurement next time, time delay is not changed in illustrating that now available bandwidth is more than (yi+1×Bi top), then now can use
Bandwidth range is in [(yj+1×Bi top), B+m].
Adjustment L is selected to make (y when first time adjustment bag is longj×Bi top)=B-m, when the delay time signal for obtaining is not become
Change, that is, measure successfully, then judge that available bandwidth is more than (yj×Bi top), next time, measurement reduced L-value, made (yj+1×Bi top) increase,
So as to reduce the scope of actual available bandwidth, concrete grammar is reducing L-value, to make (y using formula 1.3j+1×Bi top) increase to
The intermediate value of the available bandwidth scope that last time measurement is obtained；
When time delay monotone increasing in measurement next time, then available bandwidth scope is in [B-m, (yj+1×Bi top)];
When in measurement next time, time delay is not changed in, then available bandwidth scope is in [(yj+1×Bi top), B+m]；
The available bandwidth scope adjustment bag length that measurement is all obtained according to front one-shot measurement every time, is progressively reduced using two way classification
The scope of available bandwidth.
The beneficial effects of the present invention is：The present invention not only realizes the real-time monitoring to wireless network bandwidth, also improves
The precision of the measured value of wireless network available bandwidth, improves multi-hop wireless network reliability, improves the performance of network.
Description of the drawings
Fig. 1 is that the multi-hop wireless network available bandwidth measurement of the present invention implements flow chart.
At interval of t when Fig. 2 is embodied as the present invention1Time sends the schematic diagram of detection bag string.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings, but embodiments of the present invention are not limited to this.
As shown in figure 1, the step of the multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length being：
(1) a string of UDP bags are sent from source host S to destination host D, is determined according to the delay time signal that tested node is returned
The available bandwidth value B that the position of bottleneck link and one estimate.As shown in Fig. 2 UDP bags are made up of two parts, a part is
Measurement data bag, for positioning bottleneck link；Another part is load data bag, for the measurement of available bandwidth.Measurement data
Bag is completely symmetrically distributed in load data bag both sides, and the ttl value of the measurement data bag of head increases successively from 1, concrete to increase
To how much being determined by path node, path is known here.The ttl value of the measurement data bag of afterbody is decremented to 1 successively.Work as bag
A node is reached, preparation is forwarded to the ttl value of the IP stems wrapped during next node and can first reduce 1.If detecting TTL=
0, then coating discarding, while node one ICMP of transmission (Internet Control Message Protocol,
Internet Control Message Protocol) wrap to source host；If detecting TTL ≠ 0, the bag can continue to send.In order to reduce
Packet loss, arranges measurement data bag number P in experimentt_num=40 measurement data bags for being distributed in load data packet header tail both sides
Number is respectively 20, and the size of each bag is Pt_len(its representative value is 60B), load data bag number Pl_num=40, each bag
Size is Pl_len(its representative value is 500B), the ttl value of load data bag is both configured to maximum 255.Current measurement can be determined
Position bottleneck link is in node RiAnd Ri+1Between and bottleneck node RiWith an available bandwidth value B for estimating.
(2) data of the bottleneck link position obtained by step (1), reset the life cycle (letter of UDP bags string
Claiming TTL) value, so that bag string is navigated on bottleneck link, is allowed to progressively increase to i from 1, uses t1Represent the time between bag string
Interval, t2Represent that a branch of bag string is taken time by first node router, Bi topRepresent that i-th node router maximum is sent out
Transmission rate (i=1,2,3......), it is known, yjCorresponding adjustment factor when representing that the long L adjustment jth of bag is secondary, wherein 0<yj
<1, the n and L length for representing load data bag number and each bag in a branch of bag string respectively.According to t1 / (t1 + t2) ×
B1 top = (yj×Bi top)(formula 1.1), t2 = n × L/B1 top(formula 1.2).Y can be obtained by formula 1.1 and 1.2j=t1
×(B1 top)2/(t1×B1 top×Bi top+n×Bi top× L) (formula 1.3), after setting n, adjusting L according to formula 1.3 can make (yj
×Bi top)=B ± m, when equation is set up, resulting L-value seeks to the numerical value for adjusting.The length wrapped in adjusting bag string simultaneously.
The available bandwidth value B measured by step (1), predicts the exact value of actual available bandwidth between [B-m, B+m], and m takes available band
The 10% ~ 20% of wide B, then the long first time adjustment of bag needs to refer to two bounds of actual available bandwidth value B ± m.Utilize
The bound of actual available bandwidth, it may be determined that the long adjusting range of bag.Higher limit that for the first time will be with B+m as available bandwidth is sent out
Bag (lower limit that can also be with B-m as available bandwidth is given out a contract for a project), need to only change bag length and be capable of achieving.The bag string after adjustment is sent,
And it is separated by t often1Time repeats to send once, sends k time（K takes 3-5）To be averaging.
(3) after measuring every time, the Delay for receiving is fed back to source host by measured node, then source host according to
In feedback information adjustment bag string the length of packet and observe the Delay that each bag string returns judge this measurement whether into
Work(.The scope for such as obtaining the actual available bandwidth of last time measurement is [B-m, B+m], then understand that the long L of adjustment bag makes by step (2)
(yj×Bi top)=B+m, y in formulajCorresponding adjustment factor when representing that the long L adjustment jth of bag is secondary, Bi topRepresent i-th node-routing
The transmission rate of maximum, sends the bag after adjustment and goes here and there and measure, if it was observed that the time delay monotone increasing of bag string return, is judged as
Success.Otherwise, it is judged as unsuccessful；
According to feed back when extend to whether successfully information, judge the scope of available bandwidth.Adjustment L makes (yj×
Bi top)=B+m, and the delay time signal for obtaining is monotone increasing, that is, measure successfully, then judge that available bandwidth is less than (yj×Bi top),
So just increasing L-value in measurement next time makes (yj+1×Bi top) reduce, so as to reduce the scope of actual available bandwidth.Concrete side
Method is increasing L-value, to make (y using formula 1.3j+1×Bi top) it is reduced to the centre of the available bandwidth scope that last time measurement is obtained
Value.
When in measurement next time, time delay monotone increasing explanation available bandwidth is less than (yj+1×Bi top), then available bandwidth scope
In [B-m, (yj+1×Bi top)];
When in measurement next time, time delay is not changed in illustrating that now available bandwidth is more than (yi+1×Bi top), then now can use
Bandwidth range is in [(yj+1×Bi top), B+m].
The available bandwidth scope adjustment bag length that measurement is all obtained according to front one-shot measurement every time, is progressively reduced using two way classification
The scope of available bandwidth.In the same manner, if what is selected when first time adjustment bag is long is that adjustment L makes (yj×Bi top)=B-m, then adjust
The long principle of bag is identical, and method makees corresponding change.
(4) if being judged as successfully readjusting bag length repeat step (2), (3) of bag string.K bag string of statistics
Time delay dk, D (d1,d2,...,dk) be k time of same L-value bag string time delay variance.As D (d1,d2,...,dkDuring)≤Δ d,
Actual available bandwidth B is obtained*=(Bi top)2/(n×L/t1 +B1 top)。
(5) if it is unsuccessful to judge, the value of m is increased on the basis of its original Δ m, Δ m=(5% ~ 10%) × m,
Specific value is determined by network condition.When network condition is good, Δ m takes 10%；When network condition is poor, Δ m takes 5%.Repeat
Step (2), (3).If it is determined that being still unsuccessful, then return to step (1) is remeasured.
The embodiment of invention described above, does not constitute limiting the scope of the present invention.It is any at this
Done modification, equivalent and improvement etc. within bright spiritual principles, should be included in the claim protection of the present invention
Within the scope of.
Claims (4)
1. the multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length, it is characterised in that including following step
Suddenly：
(1) burst of data bag string is sent from source host S to destination host D, bottle is determined according to the delay time signal that tested node is returned
The available bandwidth value B that the position on neck chain road and one estimate；
(2) data of the bottleneck link position obtained by step (1), reset the Lifetime values of packet string to incite somebody to action
Bag string is navigated on bottleneck link, while the length wrapped in adjusting bag string, the available bandwidth value B measured by step (1), prediction are real
Between [B-m, B+m], m takes the 10%～20% of available bandwidth B to the exact value of border available bandwidth, wraps long first time adjustment ginseng
Two bounds of actual available bandwidth value B ± m are examined, using the bound of actual available bandwidth, it is determined that the long adjusting range of bag,
Higher limit with B+m as available bandwidth is given out a contract for a project or the lower limit with B-m as available bandwidth is given out a contract for a project, two kinds of principles given out a contract for a project for the first time
Identical, the method for the long adjustment of bag needs to make to change, and need to only change bag length, send the bag string after adjustment, and be separated by t often1Time
Repeat to send once, send k time, k takes 3-5, to be averaging；
(3) after measuring every time, the Delay for receiving is fed back to source host by measured node, and source host is according to feedback information
The length of packet and observe the Delay that each bag string returns and judge this measurement whether success in adjustment bag string, when obtaining
The scope of the actual available bandwidth of last time measurement is [B-m, B+m], then understand that the long L of adjustment bag makes (y by step (2)j×Bi top)=
B+m, y in formulajCorresponding adjustment factor when representing that the long L adjustment jth of bag is secondary, Bi topRepresent that i-th maximum transmission of node-routing is fast
Rate, sends the bag after adjustment and goes here and there and measure, and when the time delay monotone increasing for observing that bag string is returned, then is judged as successfully, otherwise, sentencing
Break as unsuccessful；
When being judged as successfully, then bag length repeat step (2), (3) of bag string are readjusted, time delay d of k bag string is countedk, D
(d1,d2,...,dk) be k time of same L-value bag string time delay variance, as D (d1,d2,...,dkDuring)≤Δ d, reality is obtained
Available bandwidth B*=(Bi top)2/(n×L/t1+B1 top), n represents load data bag number in a branch of bag string；
It is unsuccessful when judging, then the value of m is increased into Δ m, Δ m=(5%～10%) × m on the basis of its original, specifically
Value determine that by network condition when network condition is good, Δ m takes 10%, when network condition is poor, and Δ m takes 5%, repeat to walk
Suddenly (2), (3), when judging still as unsuccessful, then return to step (1) is remeasured.
2. the multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length according to claim 1, its
It is characterised by：Bag in described bag string is all UDP packet, and the bag is made up of two parts, and a part is
Measurement data bag, for positioning bottleneck link；Another part is load data bag, for the measurement of available bandwidth, measurement data
Bag is symmetrically dispersed in load data bag both sides, and the Lifetime values of the measurement data bag of head increase successively from 1, increase to many
Few to be determined according to path node, the Lifetime values of the measurement data bag of afterbody are decremented to 1 successively.
3. the multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length according to claim 1, its
It is characterised by：Reset in step (2) Lifetime values of measurement data Bao Gebao according to be make Lifetime values from 1 gradually
Increase to i, use t1Represent the time interval between bag string, t2Represent that a branch of bag string is taken time by first node router,
Bi topI-th node router maximum transmission rate (i=1,2,3......) is represented, it is known, yjRepresent the long L adjustment of bag
Corresponding adjustment factor during jth time, wherein 0<yj<1, n and L represents load data bag number and each bag in a branch of bag string respectively
Length, according to formula 1.1：t1/(t1+t2)×B1 top=(yj×Bi top) and formula 1.2：t2=n × L/B1 topFormula can be obtained
1.3：yj=t1×(B1 top)2/(t1×B1 top×Bi top+n×Bi top× L) (formula 1.3), after setting n, adjusted according to formula 1.3
L can make (yj×Bi top)=B ± m, when equation is set up, resulting L-value seeks to the numerical value for adjusting.
4. the multi-hop wireless network available bandwidth real-time detection method of self-adaptive detection bag length according to claim 1, its
It is characterised by：According to the Delay fed back in step (3) and whether successfully, the concrete side of the scope of available bandwidth is judged
Method is：
When adjustment L makes (yj×Bi top)=B+m, and the delay time signal for obtaining is monotone increasing, that is, measure successfully, then judge available
Bandwidth is less than (yj×Bi top), just increasing L-value in measurement next time makes (yj+1×Bi top) reduce, so as to reduce actual available bandwidth
Scope, concrete grammar is increasing L-value, to make (y using formula 1.3j+1×Bi top) it is reduced to the available band that last time measurement is obtained
The intermediate value of wide scope；
When in measurement next time, time delay monotone increasing explanation available bandwidth is less than (yj+1×Bi top), then available bandwidth scope is in [B-
m,(yj+1×Bi top)]；
When in measurement next time, time delay is not changed in illustrating that now available bandwidth is more than (yi+1×Bi top), then now available bandwidth model
It is trapped among [(yj+1×Bi top), B+m]；
Adjustment L is selected to make (y when first time adjustment bag is longj×Bi top)=B-m, when the delay time signal for obtaining is to be not changed in, i.e.,
Measure successfully, then judge that available bandwidth is more than (yj×Bi top), next time, measurement reduced L-value, made (yj+1×Bi top) increase, so as to contract
The scope of little actual available bandwidth, concrete grammar are reducing L-value, to make (y using formula 1.3j+1×Bi top) increase to last time survey
The intermediate value of the available bandwidth scope for measuring；
When time delay monotone increasing in measurement next time, then available bandwidth scope is in [B-m, (yj+1×Bi top)]；
When in measurement next time, time delay is not changed in, then available bandwidth scope is in [(yj+1×Bi top), B+m]；
The available bandwidth scope adjustment bag length that measurement is all obtained according to front one-shot measurement every time, progressively reduces available using two way classification
The scope of bandwidth.
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| CN105634842B (en) * | 2014-10-29 | 2019-01-11 | 华为技术有限公司 | A kind of method, apparatus and system of detection bandwidth |
| CN104539486A (en) * | 2015-01-15 | 2015-04-22 | 厦门大学 | End-to-end available bandwidth estimating method based on TCP acknowledgement packet pair |
| CN106302016B (en) * | 2016-08-18 | 2019-09-10 | 成都网优力软件有限公司 | The method and system of small flow quick obtaining network physical bandwidth |
| CN107332729A (en) * | 2017-06-16 | 2017-11-07 | 西安万像电子科技有限公司 | The measuring method and device of available bandwidth |
| CN107707382B (en) * | 2017-08-15 | 2018-10-23 | 贵州白山云科技有限公司 | A kind of intelligent dispatching method and device |
| CN108390799B (en) * | 2018-03-23 | 2021-05-18 | 西安电子科技大学 | Method for measuring end-to-end available key rate of quantum key distribution network |
| CN109560995A (en) * | 2019-01-11 | 2019-04-02 | 武汉虹旭信息技术有限责任公司 | The long real-time detecting system of multi-hop wireless network available bandwidth self-adaptive detection packet |
| CN109688033A (en) * | 2019-03-08 | 2019-04-26 | 深圳市网心科技有限公司 | A kind of network bandwidth evaluating method, device, system and storage medium |
| CN114401230B (en) * | 2021-12-27 | 2023-10-20 | 鹏城实验室 | Transmission rate control method and device based on cross-data center network communication |
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