CN104320809A - Wireless multi-hop network congestion control method and system based on RTT - Google Patents
Wireless multi-hop network congestion control method and system based on RTT Download PDFInfo
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- CN104320809A CN104320809A CN201410619930.5A CN201410619930A CN104320809A CN 104320809 A CN104320809 A CN 104320809A CN 201410619930 A CN201410619930 A CN 201410619930A CN 104320809 A CN104320809 A CN 104320809A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
Abstract
The invention relates to the technical field of wireless networks, and discloses a wireless multi-hop network congestion control method and system based on the RTT. The wireless multi-hop network congestion control method comprises the steps that a notification option containing a timestamp is carried by the last TCP message of sending data; a response ACK message corresponding to the notification option is received; the RTT value of TCP communication at the time is calculated according to the reception condition of the response ACK message, and a theoretical package sending rate is calculated according to the RTT value; the theoretical package sending rate and the current actual package sending rate are compared, the network congestion condition is judged accordingly, and the current actual package sending rate is adjusted correspondingly. The package loss type of a wireless network is accurately learnt through an explicit congestion notification mechanism, the congestion level of the network is predicted according to the package sending rate, congestion control and congestion avoidance are conducted dynamically, the handling capacity of a TCP in a wireless multi-hop environment is improved effectively, and the overall performance of the wireless network is further improved.
Description
Technical field
The present invention relates to wireless communication technique field, particularly relate to a kind of congestion of wireless multi-hop network control method based on RTT (Round-Trip Time, round-trip delay) and system.
Background technology
Transmission Control Protocol is the transmission control protocol extensively adopted in current Internet, but Transmission Control Protocol is the one slip agreement for wired networks design, is applicable to the wire link that error rate is low, Packet-loss ratio is low.In the wireless network, because wireless network has the higher error rate, Transmission Control Protocol can be thought network congestion by mistake and start unnecessary congestion control and avoidance mechanism, reduces the throughput of network.Meanwhile, in wireless multi-hop network environment, due to main frame constantly move, environmental change and bandwidth Rapid Variable Design, cause transmitting terminal can not grasp the bottleneck bandwidth of system in time, thus occur the phenomenon of buffer overflow packet loss, reduce further the performance of TCP.
At present, people have proposed many schemes to improve the performance of TCP in wireless multi-hop network, roughly can be divided into following three kinds: the fact that (1) declines according to Performance of Wireless TCP, a kind of congestion control mechanism towards transmitting terminal is proposed, but in order to realize congestion control, self-defined a kind of new tcp option, thus implements more complicated.(2) a kind of Fast retransmission scheme is proposed for data link layer, by accelerating the utilance and the throughput that retransmit raising network.(3) for 3G wireless network environment, feed back wireless network current channel conditions information to transmitting terminal at receiving terminal by ACK (acknowledgement, acknowledge character), then coordinate other algorithm determination packet sending speeds, optimize TCP performance, achieve good effect.
Meanwhile, also there is following defect in prior art: (1), due to reasons such as the existence of network delay and the lasting changes of wireless multi-hop network bandwidth, congestion control can not reflect the state of current network exactly; (2) prior art account form is complicated, and wireless multi-hop network node calculate is limited in one's ability, is difficult to bear the computing of intensive frequently.
Summary of the invention
Based on above shortcomings in prior art, technical problem to be solved by this invention how effectively to improve the throughput of TCP mode under wireless multi-hop environment.
For solving the problems of the technologies described above, the invention provides a kind of congestion of wireless multi-hop network control method based on RTT on the one hand, comprising step:
S1, carries the notify option comprising timestamp in last TCP message sending data;
S2, receives the response ACK message for described notify option, and wherein, also the filling time stabs further also to comprise described notify option in described response ACK message;
S3, calculates the RTT value of this TCP communication, calculates theoretical packet sending speed by described RTT value according to the reception condition of described response ACK message;
S4, contrasts described theoretical packet sending speed and current actual packet sending speed, judges network congestion thus and the described current actual packet sending speed of corresponding adjustment.
Preferably, in step S3, according to the RTT value of current measuring and calculating, utilize four jumpings to postpone principle and calculate up-to-date theoretical packet sending speed.
Preferably, in step S4, if described theoretical packet sending speed is greater than described actual packet sending speed, then adopts described theoretical packet sending speed to accelerate the transmission of packet, and described actual packet sending speed is updated to described theoretical packet sending speed;
If described theoretical packet sending speed is not more than described actual packet sending speed, then reduce described actual packet sending speed, and send packet with the actual packet sending speed after reducing.
Preferably, described method also comprises step:
S21, if described notify option be sent in start measure before, then in described response ACK message, timestamp directly fills 0, after receiving this response ACK message, strengthens packet sending speed immediately;
S22, if cannot receive response ACK message or receive the ACK message be with and postponed, then directly reduces packet sending speed.
Preferably, describedly utilize four jumpings to postpone principles to calculate up-to-date theoretical packet sending speed and comprise:
First according to the interval time P of source to the jumping figure calculating transmission packet of target;
Subsequently according to described interval time P and the described RTT value of measuring and calculating calculate theoretical packet sending speed.
On the other hand, the present invention also provides a kind of congestion of wireless multi-hop network control system based on RTT simultaneously, comprising:
Notification module, for carrying the notify option comprising timestamp in last TCP message sending data;
Receiver module, for receiving the response ACK message for described notify option, wherein, also the filling time stabs further also to comprise described notify option in described response ACK message;
Measuring and calculating module, for calculating the RTT value of this TCP communication according to the reception condition of described response ACK message, calculates theoretical packet sending speed by described RTT value;
Congestion control module, for contrasting described theoretical packet sending speed and current actual packet sending speed, judges network congestion and the described current actual packet sending speed of corresponding adjustment thus.
Preferably, in described measuring and calculating module, according to the RTT value of current measuring and calculating, utilize four jumpings to postpone principle and calculate up-to-date theoretical packet sending speed.
Preferably, described congestion control module comprises further:
Speed-raising module, for when judging that described theoretical packet sending speed is greater than described actual packet sending speed, adopting described theoretical packet sending speed to accelerate the transmission of packet, and described actual packet sending speed is updated to described theoretical packet sending speed;
Reduction of speed module, for when judging that described theoretical packet sending speed is not more than described actual packet sending speed, reduces described actual packet sending speed, and sends packet with the actual packet sending speed after reducing.
Preferably, described system also comprises:
Direct speed-raising module, for when finding that described notify option is sent in before startup is measured, in described response ACK message, timestamp directly fills 0, after receiving this response ACK message, strengthens packet sending speed immediately;
Direct reduction of speed module, for when finding cannot receive response ACK message or receive the ACK message be with and postponed, directly reduces packet sending speed.
Preferably, described measuring and calculating module comprises further:
Interval time, computing module, sent P interval time of packet for calculating to the jumping figure of target according to source;
Rate calculation module, for according to described interval time P and the described RTT value of measuring and calculating calculate theoretical packet sending speed.
Compared with prior art, the present invention utilizes ecn (explicit congestion notification) (ECN) mechanism accurately to know the packet loss type of wireless network, utilize the packet sending speed of the four jumping time delay theory calculate parties awarding the contract simultaneously, thus the congestion level of prediction network, dynamically carry out congestion control and Congestion Avoidance, thus effectively improve the throughput of TCP under wireless multi-hop environment, further improve the overall performance of wireless network.
Accompanying drawing explanation
Fig. 1 is the basic procedure schematic diagram based on the congestion of wireless multi-hop network control method of RTT in one embodiment of the present of invention;
Fig. 2 is the form schematic diagram containing the notify option of timestamp in a preferred embodiment of the present invention;
Fig. 3 is the detailed reciprocal process schematic flow sheet based on the congestion of wireless multi-hop network control method of RTT in another preferred embodiment of the present invention;
Embodiment
Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.As employed some vocabulary to censure particular elements in the middle of specification and claim.Those skilled in the art should understand, and hardware manufacturer may call same parts with different noun.This specification and claims are not used as with the difference of title the mode distinguishing parts, but are used as the criterion of differentiation with parts difference functionally.Specification subsequent descriptions is for implementing better embodiment of the present invention, and right described description is to illustrate for the purpose of rule of the present invention, and is not used to limit scope of the present invention.Protection scope of the present invention is when being as the criterion depending on the claims person of defining.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
The present invention proposes a kind of congestion of wireless multi-hop network control method based on RTT, the notify option that the method defines the band timestamp that simplifies is measured and notice work to the RTT coordinating receiving-transmitting sides, obtain theoretical packet sending speed by RTT subsequently, judge network congestion thus and control adjustment accordingly.As shown in Figure 1, in one embodiment of the invention, the method comprising the steps of:
The notify option comprising timestamp is carried in last TCP message sending data;
Receive the response ACK message for described notify option, wherein, also the filling time stabs further also to comprise described notify option in described response ACK message;
Calculate the RTT value of this TCP communication according to the reception condition of described response ACK message, calculate theoretical packet sending speed by described RTT value;
Contrast described theoretical packet sending speed and current actual packet sending speed, judge network congestion thus and the described current actual packet sending speed of corresponding adjustment.
Wherein, in a preferred embodiment of the invention, the form of the notify option of timestamp is comprised as shown in Figure 2.This notify option preferably includes 4 bytes: the 1st byte is option kind class field, and this byte has two states: a kind of is normal state, and namely normally receive response message, the phenomenons such as packet loss do not appear in network, and network condition is good; One is delay state, and packet loss appears in network, and receiving terminal finds that current TCP connection can not normal termination.All the other 3 bytes are timestamp, if this value is 0, represent that network condition is very good, otherwise represent that network has certain delay.Wherein, option kind class field is arranged according to reality situation of receiving and dispatching by transmitting terminal and responding terminal, timestamp corresponding filling in transmitting-receiving process by transmitting terminal and responding terminal.
In an embodiment of the present invention, after transmitting terminal is sent completely certain data, just send a notify option containing timestamp; Receiving terminal receives this option, terminates statistics immediately, will be currently received the full detail time used and be filled to the timestamp of option, and uses TCP message to feed back to transmitting terminal the ACK with this option; Transmitting terminal receives this ACK, calculates corresponding RTT immediately.
Preferably, transmitting terminal to the measuring method of RTT value is: receiving terminal is after last TCP message receiving band notify option (containing timestamp), an ACK message is fed back, the timestamp in ACK message with belt transect notify option and when having filled feedback to transmitting terminal; After transmitting terminal receives this ACK message, the time returned by timestamp and this TCP communication of above-noted is added, thus calculates the RTT value of this TCP communication.
In a preferred embodiment of the invention, according to the RTT value of current measuring and calculating, utilize four jumpings to postpone (four hops delay, FHD) principle and can calculate up-to-date theoretical packet sending speed R
new.Contrast theoretical packet sending speed R
newwith current actual packet sending speed R
current, get final product decision network congestion situation and adjust accordingly.Preferred judge and adjustment mode as:
If R
new>R
current, the theoretical packet sending speed that namely latest computed obtains is greater than actual packet sending speed, represents current network operational excellence, can also promote packet sending speed, thus make full use of Internet resources, therefore use R
newupgrade R
current, and make transmitting terminal by R
newspeed accelerates the transmission of packet;
If R
new≤ R
current, namely actual packet sending speed has exceeded the theoretical packet sending speed that latest computed obtains, and in the case, can determine: if continue to give out a contract for a project by actual packet sending speed, may occur congestedly causing packet loss in network.So for transmitting terminal, need R
currentbe multiplied by certain Probability p (0<p<1), reduce packet sending speed.
At theoretical packet sending speed R
newin computational process, four jump time delay theory is: owing to there is hidden terminal problem in wireless multi-hop network, in the chain type topology that a h jumps, approximately only have the packet of h/4 can transmit on link simultaneously.Based on this theory, source sends P interval time from packet to wireless network can be obtained, send packet according to this interval time of P, can avoid because of multiple packet simultaneously in the wireless network transmission there is channel confliction and cause bust this and error starting Retransmission timeout.
Particularly, interval time P calculating formula be:
wherein H is the jumping figure that target is arrived in source, and B is wireless bandwidth, S
dataand S
ackbe the size of packet and response packet respectively, t is the time that target transmission used is arrived in source.
According to this interval time of P and RTT value, theoretical packet sending speed R
newcalculating formula be:
wherein, N represents the number of times of nearest calculated RTT value, t
irepresent i-th RTT value (i.e. the time of i-th transmission needs),
represent the mean value (i.e. the mean value of the time of N transmission needs) of N number of RTT value, P
newfor the EWMA of P, there is P
new=α P
old+ (1-α) P; Wherein, P
oldfor original theoretical packet sending speed, also namely do not adopt theoretical packet sending speed during four jumping time delay principles, α tests the constant coefficient determined here, in the preferred embodiment of the present invention, α is decided to be 1/3.
In addition, in control procedure of the present invention, several special circumstances are also had to need to consider:
If before wait RTT, receiving terminal does not also have enough time to start to be measured, and transmitting terminal has just sent a request time stamp.This shows that current link conditions improves, and in this case, timestamp item directly fills 0, and transmitting terminal strengthens packet sending speed after receiving this information immediately.
Or receiving terminal does not receive the message having and stop measurement markers.For this situation, all restart timer when receiving terminal receives a message at every turn.If timer expiry, then think that network may occur congested, at this moment send the ACK message of a band delay to transmitting terminal; After transmitting terminal receives this ACK, judge that this network is congestion state, reduce packet sending speed (such as by current packet sending speed × 0.5), resend this information; If still receive the ACK of delay, reduce packet sending speed (such as continuing × 0.5) at this; Repeat, until normally can receive information, side determines current packet sending speed according to timestamp again.
Fig. 3 is the detailed reciprocal process schematic flow sheet based on the congestion of wireless multi-hop network control method of RTT in this preferred embodiment, specifically comprises step:
First, start transmitting procedure, TCP transmitting terminal starts to send packet to receiving terminal;
Transmitting terminal data are sent completely, to the notify option of receiving terminal transmit band timestamp;
Receiving terminal receives this notify option, replys, and sends ACK response message to transmitting terminal;
According to whether receiving ACK response message, transmitting terminal judges whether current network occurs congestedly causing packet loss, and tackle accordingly:
As transmitting terminal can receive ACK response message, then transmitting terminal often receives the ACK that receiving terminal sends, and just according to the RTT value of current detection, utilizes four jumpings to postpone principle and calculates up-to-date theoretical packet sending speed R
new; According to theoretical packet sending speed R
newwith current actual packet sending speed R
currentsize compare, judge network congestion and corresponding adjustment packet sending speed (time good promote speed, changing down time poor);
As transmitting terminal cannot receive ACK response message, show that network is congested, directly reduce packet sending speed.
Whole transmitting procedure is terminated when TCP connects and disconnects.
One of ordinary skill in the art will appreciate that, the all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, this program is when performing, comprise each step of above-described embodiment method, and described storage medium can be: ROM/RAM, magnetic disc, CD, storage card etc.Therefore, relevant technical staff in the field will be understood that corresponding with method of the present invention, and the present invention also comprises a kind of congestion of wireless multi-hop network control system based on RTT simultaneously, with said method step correspondingly, this system comprises:
Notification module, for carrying the notify option comprising timestamp in last TCP message sending data;
Receiver module, for receiving the response ACK message for described notify option, wherein, also the filling time stabs further also to comprise described notify option in described response ACK message;
Measuring and calculating module, for calculating the RTT value of this TCP communication according to the reception condition of described response ACK message, calculates theoretical packet sending speed by described RTT value;
Congestion control module, for contrasting described theoretical packet sending speed and current actual packet sending speed, judges network congestion and the described current actual packet sending speed of corresponding adjustment thus.
Compared with prior art, the invention provides a kind of congestion of wireless multi-hop network control method based on RTT and system, have employed the packet loss type that ecn (explicit congestion notification) mechanism (ECN) accurately knows wireless network, utilize the packet sending speed of the four jumping time delay theory calculate parties awarding the contract simultaneously, thus the congestion level of prediction network, dynamically carry out congestion control and Congestion Avoidance, avoid unnecessary intermediate node congested, better throughput is provided to the wireless multi-hop TCP of dynamic change, thus further improves the overall performance of wireless network.
It should be noted that; the foregoing is only preferred embodiment of the present invention; not thereby scope of patent protection of the present invention is limited; according to the various plans of establishment that the present invention can propose; the embodiment of other various ways can be had according to different situations; not point out one by one at this, therefore the equivalent structure change that all utilizations specification of the present invention and diagramatic content are done, or directly or indirectly apply to other correlative technology fields and be all in like manner all contained in the scope that the present invention contains.
Claims (10)
1. based on a congestion of wireless multi-hop network control method of RTT, it is characterized in that, described method comprises step:
S1, carries the notify option comprising timestamp in last TCP message sending data;
S2, receives the response ACK message for described notify option, and wherein, also the filling time stabs further also to comprise described notify option in described response ACK message;
S3, calculates the RTT value of this TCP communication, calculates theoretical packet sending speed by described RTT value according to the reception condition of described response ACK message;
S4, contrasts described theoretical packet sending speed and current actual packet sending speed, judges network congestion thus and the described current actual packet sending speed of corresponding adjustment.
2. the method for claim 1, is characterized in that, in step S3, according to the RTT value of current measuring and calculating, utilizes four jumpings to postpone principle and calculates up-to-date theoretical packet sending speed.
3. method as claimed in claim 1, it is characterized in that, in step S4, if described theoretical packet sending speed is greater than described actual packet sending speed, then adopt described theoretical packet sending speed to accelerate the transmission of packet, and described actual packet sending speed is updated to described theoretical packet sending speed;
If described theoretical packet sending speed is not more than described actual packet sending speed, then reduce described actual packet sending speed, and send packet with the actual packet sending speed after reducing.
4. the method for claim 1, is characterized in that, described method also comprises step:
S21, if described notify option be sent in start measure before, then in described response ACK message, timestamp directly fills 0, after receiving this response ACK message, strengthens packet sending speed immediately;
S22, if cannot receive response ACK message or receive the ACK message be with and postponed, then directly reduces packet sending speed.
5. method as claimed in claim 2, is characterized in that, describedly utilizes four jumpings to postpone principles to calculate up-to-date theoretical packet sending speed and comprise:
First according to the interval time P of source to the jumping figure calculating transmission packet of target;
Subsequently according to described interval time P and the described RTT value of measuring and calculating calculate theoretical packet sending speed.
6. based on a congestion of wireless multi-hop network control system of RTT, it is characterized in that, described system comprises:
Notification module, for carrying the notify option comprising timestamp in last TCP message sending data;
Receiver module, for receiving the response ACK message for described notify option, wherein, also the filling time stabs further also to comprise described notify option in described response ACK message;
Measuring and calculating module, for calculating the RTT value of this TCP communication according to the reception condition of described response ACK message, calculates theoretical packet sending speed by described RTT value;
Congestion control module, for contrasting described theoretical packet sending speed and current actual packet sending speed, judges network congestion and the described current actual packet sending speed of corresponding adjustment thus.
7. system as claimed in claim 6, is characterized in that, in described measuring and calculating module, according to the RTT value of current measuring and calculating, utilizes four jumpings to postpone principle and calculates up-to-date theoretical packet sending speed.
8. system as claimed in claim 6, it is characterized in that, described congestion control module comprises further:
Speed-raising module, for when judging that described theoretical packet sending speed is greater than described actual packet sending speed, adopting described theoretical packet sending speed to accelerate the transmission of packet, and described actual packet sending speed is updated to described theoretical packet sending speed;
Reduction of speed module, for when judging that described theoretical packet sending speed is not more than described actual packet sending speed, reduces described actual packet sending speed, and sends packet with the actual packet sending speed after reducing.
9. system as claimed in claim 6, it is characterized in that, described system also comprises:
Direct speed-raising module, for when finding that described notify option is sent in before startup is measured, in described response ACK message, timestamp directly fills 0, after receiving this response ACK message, strengthens packet sending speed immediately;
Direct reduction of speed module, for when finding cannot receive response ACK message or receive the ACK message be with and postponed, directly reduces packet sending speed.
10. system as claimed in claim 7, it is characterized in that, described measuring and calculating module comprises further:
Interval time, computing module, sent P interval time of packet for calculating to the jumping figure of target according to source;
Rate calculation module, for according to described interval time P and the described RTT value of measuring and calculating calculate theoretical packet sending speed.
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Cited By (12)
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| CN104836742A (en) * | 2015-05-07 | 2015-08-12 | 盐城工学院 | M2M (machine-to-machine) terminal and TCP transmission congestion control method and system thereof |
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| CN108494698A (en) * | 2017-12-13 | 2018-09-04 | 天津天地伟业机器人技术有限公司 | A kind of jamming control method based on transmission rate |
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| CN111245578A (en) * | 2020-01-03 | 2020-06-05 | 北京字节跳动网络技术有限公司 | Data packet transmission method and device, electronic equipment and storage medium |
| CN113300971A (en) * | 2021-02-05 | 2021-08-24 | 阿里巴巴集团控股有限公司 | Data processing system and method |
| CN114339858A (en) * | 2021-12-30 | 2022-04-12 | 天翼物联科技有限公司 | Terminal packet sending parameter adjusting method and device and related equipment |
| CN114339858B (en) * | 2021-12-30 | 2023-12-05 | 天翼物联科技有限公司 | Terminal packet sending parameter adjusting method and device and related equipment |
| CN114448800A (en) * | 2022-02-18 | 2022-05-06 | 珠海星云智联科技有限公司 | Network optimization control method and related device |
| CN115277564A (en) * | 2022-07-21 | 2022-11-01 | 深圳证券通信有限公司 | Data transmission mechanism with self-adaptive bandwidth |
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