CN102148653A - Method for realizing adaptive control over data packet overhead of exclusive OR network coding in wireless network - Google Patents
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Abstract
The invention relates to a method for realizing adaptive control over the data packet overhead of exclusive OR network coding in a wireless network, which comprises that: an intermediate node periodically detects the number of monitored data packets in own memory according to a detection time interval preset by a system, performs monitored data packet number reduction control processing if the number of the monitored data packets in the memory exceeds a maximum permissible data packet number preset by the system, otherwise continues keeping the monitored data packets in the memory, and performs a subsequent exclusive OR network coding processing operation on the monitored data packets in the memory. By the method for realizing the adaptive control over the data packet overhead of the exclusive OR network coding in the wireless network, the overhead and throughput are balanced, the overhead of report reception is reduced under the conditions of certain network throughput and a certain frame error rate, the network coding is optimized, the system overhead is reduced, the network throughput and a bandwidth utilization rate are increased, and transmission control protocol (TCP) transmission performance is improved; and the method is stable and reliable in working performance and more widely applied.
Description
Technical field
The present invention relates to wireless communication field, particularly reduce the technical field of expense and raising performance in the network code process, specifically be meant the overhead data packet Method of Adaptive Control that realizes the XOR network code in a kind of wireless network.
Background technology
In the future because the application of high data rate requires to require than present network rate high to network rate.The research of this respect is valuable, especially the research in wireless network.Some achievements in research in the wireless network have reached maximum output.The most significant research comprises OFDM and WiMAX technology, and they are powerful competitors of broadband wireless technology in future.In 2000, people such as Ahlswede have proposed the viewpoint of the such novelty of network code.Because it improves to compare with traditional routing mechanism to performance great benefit is arranged, bud out into popularity in different network communication field year by year.Although it does not also have formal standard, certainly in the future Routing Protocol, it is strong competitor that network code is bound to.It simply will not encoded wraps in to put on the intermediate node and encodes in the same bag and then send out.From the viewpoint of theory, aspect bandwidth usage and network throughput tradition route, this method is compared this method and is produced very high performance benefit.Specifically please refer to following document:
S.Katti，H.Rahul，W.Hu，D.Katabi，M.Medard，and?J.Crowcroft，“XORs?in?the?Air：Practical?Wireless?Network?Coding，”IEEE/ACM?Trans.Netw.，vol.16，pp.497-510，June?2008.
A.Campo?and?A.Grant，“Robustness?of?Random?Network?Coding?to?Interfering?Sources，”inProc.7th?Australian?Communications?Theory?Workshop，pp.120-124，Feb.2006.
E.Fasolo，M.Rossi，J.Widmer，and?M.Zorzi，“On?MAC?Scheduling?and?Packet?CombinationStrategies?for?Practical?Random?Network?Coding，”in?Proc.IEEE?ICC’07，pp.3582-3589，June2007.
J.Jin?and?B.Li，“Adaptive?Random?Network?Coding?in?WiMAX，”in?Proc.IEEE?ICC’08，pp.2576-2580，May?2008.
D.Katabi，S.Katti，W.Hu，H.Rahul，and?M.Medard，“On?Practical?Network?Coding?forWireless?Environments，”in?Proc.Int’l?Zurich?Seminar?on?Communications，pp.84-85，2006.
D.Nguyen，T.Tran，T.Nguyen，and?B.Bose，“Hybrid?ARQ-random?network?coding?forwireless?media?streaming，”in?Proc.ICCE’08，pp.115-120，June?2008.
L.Scalia，F.Soldo，and?M.Gerla，“PiggyCode：A?MAC?Layer?Network?Coding?Scheme?toImprove?TCP?Performance?Over?Wireless?Networks，”in?Proc.IEEE?GLOBECOM’07，pp.3672-3677，Nov.2007.
M.Wang?and?B.Li，“Lava：A?reality?check?of?network?coding?in?peerto-peer?live?streaming，”in?Proc.IEEE?INFOCOM’07，pp.1082-1090，May?2007.
Although aspect Wireless Network Coding, done a lot of researchs, also obtained some aspect of performances raising (with reference to following document:
S.Katti，H.Rahul，W.Hu，D.Katabi，M.Medard，and?J.Crowcroft，“XORs?in?the?Air：Practical?Wireless?Network?Coding，”IEEE/ACM?Trans.Netw.，vol.16，pp.497-510，June?2008.
D.Katabi，S.Katti，W.Hu，H.Rahul，and?M.Medard，“On?Practical?Network?Coding?forWireless?Environments，”in?Proc.Int’l?ZurichSeminar?on?Communications，pp.84-85，2006.
Y.Wu，“A?Trellis?Connectivity?Analysis?of?Random?Linear?Network?Coding?with?Buffering，”in?Proc.IEEE?IS’06，pp.768-772，July?2006.)。But people such as Koutsonikolas (please refer to D.Koutsonikolas, Y.C.Hu, and C.-C.Wang, " An Empirical Study of Performance Benefits of Network Coding inMultihop Wireless Networks; " in Proc.IEEE INFOCOM ' 09., 2009.) finds that in these researchs the performance advantage of coding can be subjected to great restriction.The reason of a part is successfully that Code And Decode can produce delay, and is congested, and inefficient bandwidth usage etc., thereby make network code produce expense.There have been a lot of researchs to solve this problem in this respect.People such as Chou (please refer to P.Chou, Y.Wu, and K.Jain, " Practical Network Coding; " Allerton Conferenceon Communication, Control and Computing, 2003.) proposed a memory model and minimize and unwrap pin.Although this method can improve some performances, very easily be subjected to the influence of packet loss.People such as Halloush (please refer to M.Halloushand H.Radha, " Network coding with multi-generation mixing, " in Proc.CISS ' 088, (Piscataway, NJ, USA), pp.515-20,2008.network coding; Multigeneration mixing; Data propagation; Datarecovery.) propose a method better, but when performance improves, will increase the size of memory.With reference to J.Jin and B.Li, " Adaptive Random Network Coding in WiMAX; " inProc.IEEE ICC ' 08, pp.2576-2580, people such as Jin among the May 2008. have designed a kind of adaptive random network code in WiMAX, it adjusts the change that block size is dealt with channel condition by the number self adaptation of upstream node.With reference to R.Prasad, H.Wu, D.Perkins, and N.-F.Tzeng, " Local Topology Assisted XOR Coding in Wireless Mesh Networks, " in Proc.ICDCS ' 08, pp.156-161, people such as Prasad among the June 2008. have proposed a kind of new coding strategy, XOR network code (XOR-TOP), and it uses local topology effectively to assess available bag of not encoding on the neighbors.They claim they method can with neighbors exchange message, the recognition coding chance that just can prepare.Yet radio link conditions is unpredictable.In the local network topology frequent variations, can assessment make mistakes.People such as Katti (please refer to S.Katti, H.Rahul, W.Hu, D.Katabi, M.Medard, and J.Crowcroft, " XORs in the Air:Practical WirelessNetwork Coding, " IEEE/ACM Trans.Netw., vol.16, pp.497-510, June 2008.) in receiving report, use bitmap format.Even this method make to receive report not only closely but also effective, their mixing W method is imperfect.
In the prior art, when node obtains chance and sends packet, it can travel through whole from network monitoring to the set of bag, and therefrom seek suitable bag, and from receive report, extract information, be placed on together to send in the bag and send.Therefore, if transmission volume is very high, node can listen to a lot of bags in particular time interval.When transmission rate is very high, just have a lot of bags and be stored in the memory, receive report like this and will become very long.Can increase extra frame error rate like this, thereby cause performance to reduce.Consumed a lot of bandwidth owing to receive report, through-put power and node memory, the utilization of network node resource also is that efficient is low-down.
Therefore, need a kind of new method of design, effectively the pack processing expense can store monitoring again and be wrapped in memory, is beneficial to reduce power overhead, thereby can realize effectively utilizing the purpose of the memory of bandwidth and node.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of and can optimize network code, reduce expense, improve network throughput, improve bandwidth utilization, significantly improve the overhead data packet Method of Adaptive Control that TCP transmission performance, stable and reliable working performance, the scope of application realize the XOR network code comparatively widely in the wireless network.
In order to realize above-mentioned purpose, realize in the wireless network of the present invention that the overhead data packet Method of Adaptive Control of XOR network code is as follows:
Realize the overhead data packet Method of Adaptive Control of XOR network code in this wireless network, its main feature is that described method may further comprise the steps:
(1) intermediate node in the Radio Network System is according to the quantity of monitored data bag in the memory of the assay intervals time cycle property ground detection self of systemic presupposition;
(2) if the quantity of the monitored data bag in the memory has surpassed the packet maximum quantity of the permission storage of systemic presupposition, then this intermediate node carries out monitored data bag reduced number control and treatment;
(3) if the quantity of the monitored data bag in the memory does not surpass the packet maximum quantity of the permission storage of systemic presupposition, then this intermediate node continues the monitored data bag in the reserve storage;
(4) described intermediate node carries out follow-up XOR network code processing operation to the monitored data bag in the memory.
The assay intervals time of the systemic presupposition in this wireless network in the overhead data packet Method of Adaptive Control of realization XOR network code is 10ms.
Intermediate node in this wireless network in the overhead data packet Method of Adaptive Control of realization XOR network code carries out monitored data bag reduced number control and treatment, may further comprise the steps:
(11) the described intermediate node monitored data bag that will enter the earliest in self the memory abandons;
(12) whether the quantity of the monitored data bag in the detection of stored device still surpasses the packet maximum quantity of the permission storage of systemic presupposition;
(13) if then return above-mentioned steps (11);
(14) if not, then continue above-mentioned steps (4).
The packet maximum quantity of realizing the permission storage of the systemic presupposition in the overhead data packet Method of Adaptive Control of XOR network code in this wireless network is not higher than the quantity of the monitored data bag in self the memory that allows to be stored in intermediate node under the frame error rate condition of systemic presupposition for guaranteeing this wireless network.
Adopted the overhead data packet Method of Adaptive Control that realizes the XOR network code in the wireless network of this invention, owing to wherein used adaptive control stand-by period algorithm, by wrapping in stand-by period in the node memory that automatic control listens to, just from entering memory to the time interval that sends, thereby reach the balance of expense and throughput, not only can effectively improve bandwidth availability ratio, and can under the condition of certain network throughput and frame error rate, reduce the expense that receives report, simultaneously can also optimize network code, reduced overhead, improved network throughput, improved bandwidth utilization, significantly improved the TCP transmission performance, stable and reliable working performance, the scope of application are comparatively extensive.
Description of drawings
Fig. 1 realizes forwarding information packet header frame structure schematic diagram in the overhead data packet Method of Adaptive Control of XOR network code in the wireless network of the present invention.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also shown in Figure 1ly, realize the overhead data packet Method of Adaptive Control of XOR network code in this wireless network, comprising following steps:
(1) intermediate node in the Radio Network System is according to the quantity of monitored data bag in the memory of the assay intervals time cycle property ground detection self of systemic presupposition; The assay intervals time of this systemic presupposition is 10ms;
(2) if the quantity of the monitored data bag in the memory has surpassed the packet maximum quantity of the permission storage of systemic presupposition, then this intermediate node carries out monitored data bag reduced number control and treatment, may further comprise the steps:
(a) the described intermediate node monitored data bag that will enter the earliest in self the memory abandons;
(b) whether the quantity of the monitored data bag in the detection of stored device still surpasses the packet maximum quantity of the permission storage of systemic presupposition;
(c) if then return above-mentioned steps (a);
(d) if not, then continue step (4);
(3) if the quantity of the monitored data bag in the memory does not surpass the packet maximum quantity of the permission storage of systemic presupposition, then this intermediate node continues the monitored data bag in the reserve storage;
(4) described intermediate node carries out follow-up XOR network code processing operation to the monitored data bag in the memory.
Wherein, the packet maximum quantity of the permission of described systemic presupposition storage is not higher than the quantity of the monitored data bag in self the memory that allows to be stored in intermediate node under the frame error rate condition of systemic presupposition for guaranteeing this wireless network.
In the middle of reality was used, the relevant Mathematical Modeling of method of the present invention was as follows:
Especially, following (1) formula:
F wherein
eBe frame error rate, BER is bit error rate and L
FrIt is frame length.Make l
cBe to receive the obtainable length of report in XOR (XOR) head; L
Fr=L
d+ l
c, L wherein
dIt is the original position of data in the frame.Consider that two receive report l
CiAnd l
Cj, its length difference, for example:
l
ci＜l
cj，ΔF
e＝F
ej-F
ei。
Thereby can obtain:
From formula (2), | 1-BER|＜1.Therefore, corresponding Δ F
e〉=0, l
Ci≤ l
CjL is set
Ci=0 as the reference length in the XOR head, can obtain:
In formula (3), l
CjIt is the expense that receives report in the XOR packet header.It is long more to wrap in the time of staying in the memory, and the head of XOR and bag are own just long more.If W sends the average time that each bag uses in the memory, λ is the Mean Speed that bag arrives in the memory.N is a bag number average in the memory.According to fermat's little theorem:
N＝λW
As can be seen from Figure 1, the reservation of a byte is arranged in the head of XOR, expression receives in the report several reports.There are 5 bytes to be retained in addition, represent that each bag has been reported several times.Therefore, l
Cj=8+40N, unit are bit (bit).If W ∈ 10ms, and 50ms, 100ms, 500ms}, and consider L
d=160 bytes (bytes), BER=5169917364 * 10
-4, the error rate of bag is PER=0.01 in wherein considering, N
Retrans=6, N
Fr=1.
If W=10ms and λ=10pkts/sec, N=λ W=0.1 so.Draw:
λW＝0.1，ΔF
e＝3.28644×10
-3
Notice Δ F
eWhat represent is the frame error rate that causes the increase of frame length to increase owing to the expense that receives report.If the time that bag is waited for is that the arrival rate of 0.2sec and bag is 50 bags of per second, frame error rate just increases by 20% so.
In the method for the invention, employing is adaptive control stand-by period algorithm.
The basic ideas of this method are as follows:
Monitoring bag number in the control storage has been controlled and has been monitored after the number of bag, and the expense that receives report is just fixing, can not increase arbitrarily.The automatic stand-by period of controlling packet in memory under the condition of the frame error rate of given monitoring bag arrival rate and requirement.Especially, when the bag of some is stored in the memory, each Δ F of generation
eAll be sustainable.If Ω is illustrated in a specific frame error rate F
eThe time can be stored in the number of the monitoring bag in the memory.No matter when there are a monitoring bag or the bag of self to be sent by node.For each extra bag, our method guarantees that the bag in the memory can not be greater than Ω.The stand-by period of each bag, (W) was updated to 10ms.
If when having more bag to be added in the memory in 10ms, the bag in the memory will be dropped after waiting for less time so.If in particular time interval, the bag in the memory is fewer, can wait for more time so.
λ relates to Network grade and wireless channel conditions.If network traffic has increased, the quantity of the bag that listens to will increase.And, if quality of channel is very poor at that time, more Bao Buhui be sent out and memory in can not store them yet.
Adaptive W is the time that bag can consume in memory, W ∈ { t
1, t
2..., t
n, wherein
Be optimum wrapping in the time that consumes in the memory.
Unwrap pin by adaptive control, loss rate will minimize.And, it and fixing W method compared optimum utilization bandwidth, node memory and through-put power.Yet the complexity of this method meeting drawing-in system on the average arrival rate estimation network grade of service information of wrapping by monitoring.Based on the frame error rate of these information and requirement, this method can be selected the optimum stand-by period that wraps in the memory dynamically.
About other correlation technique of the present invention, can also consult following documents and materials:
Y.Yamao，H.Suda，N.Umeda，and?N.Nakajima，“Radio?access?network?design?concept?forthe?fourth?generation?mobile?communication?system，”in?in?Proc?IEEE?VTC’00，vol.3，pp.2285-2289vol.3，2000.
R.Ahlswede，N.Cai，S.-Y.Li，and?R.Yeung，“Network?Information?Flow，”IEEE?Trans.Inform.Theory，vol.46，pp.1204-1216，Jul.2000.
S.W.Kim，“Concatenated?Random?Parity?Forwarding?in?Large-Scale?Multi-Hop?RelayNetworks，”in?in?Proc.IEEE?MILCOM’07.，pp.1-7，Oct.2007.
Adopted the overhead data packet Method of Adaptive Control that realizes the XOR network code in the above-mentioned wireless network, owing to wherein used adaptive control stand-by period algorithm, by wrapping in stand-by period in the node memory that automatic control listens to, just from entering memory to the time interval that sends, thereby reach the balance of expense and throughput, not only can effectively improve bandwidth availability ratio, and can under the condition of certain network throughput and frame error rate, reduce the expense that receives report, simultaneously can also optimize network code, reduced overhead, improved network throughput, improved bandwidth utilization, significantly improved the TCP transmission performance, stable and reliable working performance, the scope of application are comparatively extensive.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (4)
1. realize the overhead data packet Method of Adaptive Control of XOR network code in the wireless network, it is characterized in that described method may further comprise the steps:
(1) intermediate node in the Radio Network System is according to the quantity of monitored data bag in the memory of the assay intervals time cycle property ground detection self of systemic presupposition;
(2) if the quantity of the monitored data bag in the memory has surpassed the packet maximum quantity of the permission storage of systemic presupposition, then this intermediate node carries out monitored data bag reduced number control and treatment;
(3) if the quantity of the monitored data bag in the memory does not surpass the packet maximum quantity of the permission storage of systemic presupposition, then this intermediate node continues the monitored data bag in the reserve storage;
(4) described intermediate node carries out follow-up XOR network code processing operation to the monitored data bag in the memory.
2. realize the overhead data packet Method of Adaptive Control of XOR network code in the wireless network according to claim 1, it is characterized in that the assay intervals time of described systemic presupposition is 10ms.
3. realize the overhead data packet Method of Adaptive Control of XOR network code in the wireless network according to claim 1, it is characterized in that described intermediate node carries out monitored data bag reduced number control and treatment, may further comprise the steps:
(11) the described intermediate node monitored data bag that will enter the earliest in self the memory abandons;
(12) whether the quantity of the monitored data bag in the detection of stored device still surpasses the packet maximum quantity of the permission storage of systemic presupposition;
(13) if then return above-mentioned steps (11);
(14) if not, then continue above-mentioned steps (4).
4. according to the overhead data packet Method of Adaptive Control that realizes the XOR network code in each described wireless network in the claim 1 to 3, it is characterized in that the packet maximum quantity of the permission of described systemic presupposition storage is not higher than the quantity of the monitored data bag in self the memory that allows to be stored in intermediate node under the frame error rate condition of systemic presupposition for guaranteeing this wireless network.
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Cited By (3)
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| CN102497251A (en) * | 2011-12-08 | 2012-06-13 | 北京交通大学 | Adaptive modulation coding method in wireless MESH network |
| CN103152359A (en) * | 2013-03-25 | 2013-06-12 | 重庆大学 | Method for improving end-to-end wireless transmission control protocol (TCP) linear network coding |
| CN110892661A (en) * | 2017-07-11 | 2020-03-17 | 区块链控股有限公司 | Optimizing network parameters to achieve network coding |
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| CN103152359A (en) * | 2013-03-25 | 2013-06-12 | 重庆大学 | Method for improving end-to-end wireless transmission control protocol (TCP) linear network coding |
| CN103152359B (en) * | 2013-03-25 | 2016-03-23 | 重庆大学 | Improving one's methods of a kind of end-to-end wireless transmission control protocol linear network encoding |
| CN110892661A (en) * | 2017-07-11 | 2020-03-17 | 区块链控股有限公司 | Optimizing network parameters to achieve network coding |
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Application publication date: 20110810 |