CN104618258B - A kind of control method of message transmission rate - Google Patents
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- CN104618258B CN104618258B CN201510059631.5A CN201510059631A CN104618258B CN 104618258 B CN104618258 B CN 104618258B CN 201510059631 A CN201510059631 A CN 201510059631A CN 104618258 B CN104618258 B CN 104618258B
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Abstract
The invention provides a kind of control method of message transmission rate, this method includes：Streaming media server determines QoS index, judges current network congestion situation；According to current network congestion situation, the master control that adjustment packet is sent postpones, and utilizes the master control to postpone control network throughput.The invention provides a kind of transfer control method for the limited streaming media server of hardware condition, the real-time and validity of streaming media are improved, transmission rate is effectively adjusted, and significantly improves QoS.
Description
Technical field
The present invention relates to network transmission and communication, more particularly to a kind of flow-medium transmission method.
Background technology
In recent years, it is how right with internet and the high speed development of information technology, and the combination of server and internet
Procotol optimizes, the efficiently transmitting multimedia data, and avoid causing network congestion under limited network bandwidth,
Become one of developing direction of media server such as video, voice.The transmission of stream medium data on the internet relies on network
Host-host protocol, including TCP and UDP host-host protocols, if transmitted with the agreement for not possessing any sequence, re-transmission and congestion control
Multi-medium data, network bandwidth can be exhausted rapidly, and as the deterioration of network state, the increase of number of dropped packets can also influence to pass
Transmission quality.Existing congestion control is not suitable for the limited embedded device of hardware condition, not according to the characteristics of embedded device
Adjust accordingly, the real-time and accuracy of stream medium data in embedded device can not be met.Therefore, for correlation technique
In the presence of above mentioned problem, not yet propose effective solution at present.
The content of the invention
To solve the problems of above-mentioned prior art, the present invention proposes a kind of controlling party of message transmission rate
Method, including：
Flush type stream media server determines QoS index, judges current network congestion situation；
According to current network congestion situation, the master control that adjustment packet is sent postpones, and utilizes the master control to postpone control net
Network handling capacity.
Preferably, the QoS index includes packet loss, and described according to current network congestion situation, adjusts packet
The master control delay of transmission, postpone control network throughput using the master control, further comprise：
(1) the network delay γ (1) at the 1st moment is calculated according to network delay value formula, in this, as the network at the 1st moment
Delay estimation value R (1), the network delay γ (2) at the 2nd moment is then calculated, the network for calculating for the 2nd moment by smoothing formula prolongs
Slow estimate, the smoothing formula are as follows：
R (t)=(1- θ) R (t-1)+θ γ (t)
θ is smoothing factor in formula, is the constant between 0-1；
(2) network delay estimate R (t) is subjected to regularization, the network delay grade M (t) for making to calculate is between 0-1
Numerical value, calculate M (t) method it is as follows：
M (t)=R (t)/τ
τ postpones for tolerable maximum network in formula；
(3) transmission rate is adjusted using the method based on master control delay, including：
A master control delay is spaced between each two packet, or a master control is spaced between every two groups of packets and is prolonged
Late, the parameter D (t) of master control delay scope is [Dl, Dh], DlAnd DhCalculation formula is as follows：
Dl=Mave/Mh
Dh=Mave/Ml
M in formulahAnd MlThe minimum and maximum volume of transmitted data that system is allowed respectively in the unit interval, MaveTo be each or
Every group of data package size；
(4) judgement of congestion situation：Set two congestion threshold LhAnd Ll, and 0<Ll<Lh<1, [0, Ll] it is used as idle shape
State, [Lh, 1] and congestion condition is used as, according to different network delay grade M (t) congestion situations different with M (t-1) judgements, so
Computation rate adjusting parameter d is distinguished afterwards, is specifically included：
Situation 1：M(t)≥LhAnd M (t-1)<Lh, i.e. the t-1 moment is introduced into congestion condition, and t enters congestion condition, then
Transmission rate is reduced by increasing master control delay：
D=(Dh-Dl)·(M(t)-Lh)/(1-Lh)
D (t)=min { D (t)+d, Dh}
Situation 2：M(t)≥M(t-1)≥Lh, i.e. the t-1 moment has been enter into congestion condition, and t Congestion Level SPCC is than the t-1 moment
Seriously, then transmission rate is reduced by increasing master control delay：
D=(Dh-Dl)·(M(t)-M(t-1))/(1-Lh)
D (t)=min { D (t)+d, Dh}
Situation 3：M(t)<Ll, i.e. t enters idle condition, then accelerates transmission rate by reducing master control delay：
D=(Dh-Dl)·(Ll-M(t))/Ll
D (t)=max { D (t)-d, Dl}
Situation 4：If belonging to other situations of 3 kinds of situations of the above, any speed adjust, i.e. D (t)=D need not be made
(t)。
The present invention compared with prior art, has advantages below：
The invention provides a kind of transfer control method of the streaming media server limited for hardware condition, stream is improved
The real-time and validity of media transmission, transmission rate are effectively adjusted, and significantly improve QoS.
Brief description of the drawings
Fig. 1 is the flow chart of the control method of message transmission rate according to embodiments of the present invention.
Embodiment
Retouching in detail to one or more embodiment of the invention is hereafter provided together with the accompanying drawing for illustrating the principle of the invention
State.The present invention is described with reference to such embodiment, but the invention is not restricted to any embodiment.The scope of the present invention is only by right
Claim limits, and the present invention covers many replacements, modification and equivalent.Illustrate in the following description many details with
Thorough understanding of the present invention is just provided.These details are provided for exemplary purposes, and without in these details
Some or all details can also realize the present invention according to claims.
The purpose of congestion control is exactly to control network throughput, so as to realize low packet loss ratio, low network delay and low jitter.
For streaming media server, remote wan communication is its a big feature, and network is should be taken into account in congestion control
The problem of delay, while in order to mitigate network burden, round-trip delay is replaced with one-way delay.The time is added in sender packet header
Stamp, network delay can be calculated according to the timestamp of sender and reception time in recipient, so as to computing relay.The present invention
The improved congestion avoidance algorithm of institute is to add sequence number and timestamp in data packet head, by determine packet loss, network delay come pair
Network state is estimated and judged.
An aspect of of the present present invention provides a kind of control method of message transmission rate.Fig. 1 is according to embodiments of the present invention
Message transmission rate control method flow chart.
The mechanism of embedded media server data rate adjustment is, in each two packet or every two groups of packets
The master control delay of a period of time is undergone between transmission, the length postponed by master control controls network throughput.Speed adjust mechanism
Message transmission rate is all based on, i.e., the data volume that should be sent by the formula calculating subsequent time unit interval, is then carried out
Adjustment.So the mechanism of speed adjust is accurate for the computer that CPU process performances are higher, system clock accuracy is higher
And it is effective, but be inappropriate for the streaming media server of limited system resources.In summary, for based on embedding
For the streaming media server for entering formula equipment, the Regulation mechanism of transmission rate should not be taken based on, and master control should be taken based on and prolonged
Slow speed adjust mechanism, both handling capacity can effectively be controlled with simplified code complexity again.
The present invention uses dual threshold, and improves the decision method of network state.For packet loss and network delay this
Two congestion metrics, the jamming control method based on packet loss and the jamming control method based on network delay is respectively adopted.
The congestion avoidance algorithm flow based on packet loss is described below.
(1) the packet loss ρ (1) at the 1st moment is calculated according to packet loss formula, is estimated in this, as the packet loss at the 1st moment
Value P (1).Then the packet loss ρ (2) at the 2nd moment is calculated, the packet loss estimate at the 2nd moment is calculated by smoothing formula.It is described
Smoothing formula is as follows：
P (t)=(1- α) P (t-1)+α ρ (t)
α is smoothing factor in formula, is the constant between 0-1.When α is close to 1, packet loss estimate P (t) is close to be lost
Bag rate ρ (t), smooth effect unobvious；When α is close to 0, packet loss estimate P (t) estimates close to the packet loss of last moment
Evaluation P (t-1), excessively steadily, present packet loss can not be tracked in time.So different α should be selected according to different needs.
In the present embodiment, in order to take into account real-time and stability, smoothing factor takes 0.5.
(2) calculated to simplify, packet loss estimate P (t) is subjected to regularization, makes the packet loss grade L (t) calculated
Numerical value between 0-1.Formula is as follows：
L (t)=P (t)/β
β is tolerable maximum packet loss in formula, and this value is pre-selected according to different demands.3% work is selected in the present invention
For tolerable maximum packet loss.
(3) transmission rate is adjusted using the method based on master control delay：One is spaced between each two packet
Individual master control delay, or a master control delay is spaced between two groups of packets (every group has several packets).The ginseng of master control delay
Number D (t) scope is [Dl, Dh], wherein DlAnd DhNeed to be required according to chip performance, operating system precision and specific tasks
And select.DlAnd DhCalculation formula is as follows：
Dl=Mave/Mh
Dh=Mave/Ml
M in formulahAnd MlThe minimum and maximum volume of transmitted data that system is allowed respectively in the unit interval, MaveTo be each or
Every group of data package size.
(4) judgement of congestion situation：Set two congestion threshold LhAnd Ll, and 0<Ll<Lh<1.[0, Ll] it is used as idle shape
State, [Lh, 1] and it is used as congestion condition.According to different packet loss grade L (t) congestion situations different with L (t-1) judgements, then
Computation rate adjusting parameter d respectively.
Situation 1：L(t)≥LhAnd L (t-1)<Lh, i.e. the t-1 moment is introduced into congestion condition, and t enters congestion condition, should
Transmission rate is reduced by increasing master control delay.
D=(Dh-Dl)·(L(t)-Lh)/(1-Lh)
D (t)=min { D (t)+d, Dh}
Situation 2：L(t)≥L(t-1)≥Lh, i.e. the t-1 moment has been enter into congestion condition, and t Congestion Level SPCC is than the t-1 moment
It is more serious, transmission rate should be reduced by increasing master control delay.
D=(Dh-Dl)·(L(t)-L(t-1))/(1-Lh)
D (t)=min { D (t)+d, Dh}
Situation 3：L(t)<Ll, i.e. t enters idle condition, should accelerate transmission rate by reducing master control delay.
D=(Dh-Dl)·(Ll-L(t))/Ll
D (t)=max { D (t)-d, Dl}
Situation 4：Other situations of 3 kinds of situations except more than, it is not necessary to make any speed adjust.That is D (t)=D (t)
Congestion avoidance algorithm based on network delay and the congestion avoidance algorithm based on packet loss are essentially identical, it is only necessary to use
Corresponding network delay replaces packet loss, then substitutes into above formula and calculates.
(1) the network delay γ (1) at the 1st moment is calculated according to network delay value formula, in this, as the network at the 1st moment
Delay estimation value R (1).Then the network delay γ (2) at the 2nd moment is calculated, the network for calculating for the 2nd moment by smoothing formula prolongs
Slow estimate.The smoothing formula is as follows：
R (t)=(1- θ) R (t-1)+θ γ (t)
θ is smoothing factor in formula, is the constant between 0-1.When θ is close to 1, network delay estimate R (t) is close
Network delay γ (t), smooth effect unobvious；When θ is close to 0, network delay estimate R (t) is close to last moment
Network delay estimate R (t-1), excessively steadily, current network delay can not be tracked in time.So should according to different needs,
Select different θ.In the present embodiment, in order to take into account real-time and stability, smoothing factor takes 0.5.
(2) calculated to simplify, network delay estimate R (t) is subjected to regularization, makes the network delay grade calculated
Numerical value of the M (t) between 0-1.Formula is as follows：
M (t)=R (t)/τ
τ postpones for tolerable maximum network in formula, and this value is pre-selected according to different demands.3% is selected in the present invention
Postpone as tolerable maximum network.
(3) transmission rate is adjusted using the method based on master control delay：One is spaced between each two packet
Individual master control delay, or a master control delay is spaced between two groups of packets (every group has several packets).The ginseng of master control delay
Number D (t) scope is [Dl, Dh], wherein DlAnd DhNeed to be required according to chip performance, operating system precision and specific tasks
And select.DlAnd DhCalculation formula is as follows：
Dl=Mave/Mh
Dh=Mave/Ml
M in formulahAnd MlThe minimum and maximum volume of transmitted data that system is allowed respectively in the unit interval, MaveTo be each or
Every group of data package size.
(4) judgement of congestion situation：Set two congestion threshold LhAnd Ll, and 0<Ll<Lh<1.[0, Ll] it is used as idle shape
State, [Lh, 1] and it is used as congestion condition.According to different network delay grade M (t) congestion situations different with M (t-1) judgements, so
Computation rate adjusting parameter d is distinguished afterwards.
Situation 1：M(t)≥LhAnd M (t-1)<Lh, i.e. the t-1 moment is introduced into congestion condition, and t enters congestion condition, should
Transmission rate is reduced by increasing master control delay.
D=(Dh-Dl)·(M(t)-Lh)/(1-Lh)
D (t)=min { D (t)+d, Dh}
Situation 2：M(t)≥M(t-1)≥Lh, i.e. the t-1 moment has been enter into congestion condition, and t Congestion Level SPCC is than the t-1 moment
It is more serious, transmission rate should be reduced by increasing master control delay.
D=(Dh-Dl)·(M(t)-M(t-1))/(1-Lh)
D (t)=min { D (t)+d, Dh}
Situation 3：M(t)<Ll, i.e. t enters idle condition, should accelerate transmission rate by reducing master control delay.
D=(Dh-Dl)·(Ll-M(t))/Ll
D (t)=max { D (t)-d, Dl}
Situation 4：Other situations of 3 kinds of situations except more than, it is not necessary to make any speed adjust.That is D (t)=D (t)
It is for LAN and the different network environments of wide area network, both the above congestion avoidance algorithm is whole with the relation of "or"
Altogether, so that it may realize the judgement and control to network congestion degree.
Network transmission with congestion control is a closed loop, and network connection is related to the different types of data of two ports
Transmitting-receiving.Streaming media server end and client are required for opening two threads, establish two sockets, corresponding two different ends
Mouthful, the transmission of multi-medium data and control signal is carried out respectively.
In server end, the transmission thread of server end takes multi-medium data pending from buffering area, adds timestamp
Sent with after sequence number, then check whether and obtain new speed adjust parameter.If it is, then change master control delay parameter；
Otherwise, master control delay is carried out according to parameter before.Receiving thread receives the velocity feedback data from client, once receive
To new speed adjust parameter, inform send thread modification master control delay parameter immediately.
In client, the receiving thread of client receives the multi-medium data from server end, then takes its data, sequence
Number and timestamp, carry out network state judgement, and velocity feedback new at calculating according to congestion avoidance algorithm mentioned above
Value, transmission thread is pushed to, send thread and be transmitted once new speed feedback value is obtained.
According to another embodiment of the present invention, the neural network forecast amount needed for transmission rate control includes packet loss and stream matchmaker
Volume data percent of pass, is counted in receiving terminal to above-mentioned parameter.In order to prevent caused by the parameter acquiring cycle is shorter
Shake, using weighting smoothing processing.
If RiAnd PiThe stream medium data percent of pass during streaming media in i-th of time interval is represented respectively and is lost
Bag rate.RiAnd PiComputational methods are as follows：
Ri=ΣN-1 J=0(μjDi-j/Ti-j), wherein ΣN-1 J=0(μj)=1；
PI=ΣN-1 J=0(αjLPi-j/SPi-j), wherein ΣN-1 J=0(αj)=1；
N represents to calculate the time interval number needed for above-mentioned two parameter, α in above formulajAnd μjRepresent weight coefficient；
LPi-jFor packet loss in (i-j) time interval, SPi-jThe number-of-packet sent for transmitting terminal in (i-j) time interval.Di-j
Represent the receiving stream media data volume of statistics in (i-j) time interval, Ti-jRepresent the exact value of (i-j) time interval.
Rate control mechanism according to the present embodiment is：In network underloading, by the change constant additivity that packet loss determines because
Son and constant add factor determine speed increasing degree, in network overload, the change constant that is determined by packet loss multiply sex factor with
Constant subtracts sex factor and determines rate reduction amplitude.
The step of Adaptive Rate Shape, is as follows：
1) constant parameter is set.The patient packet loss highest threshold value P of institute during streaming medialmaxAnd Streaming Media
The minimum packet loss threshold value P of facile transportlmin；Maximum stream medium data transmission rate RmaxAnd minimum stream medium data is sent
Speed Rmin；
2) network state is judged.Network state can be determined by comparing actual measurement packet loss and packet loss threshold value.Work as Pi>
Plmax, wireless network is judged as overloading；Work as Pi<Plmin, wireless network is judged as underloading；Work as Plmin<Pi<Plmax, now without
Gauze network is poised state, it is not necessary to carries out speed adjust.
3) network overload is handled.System should reduce stream medium data speed to ensure the QoS of Streaming Media receiving terminal.First
Determine that network continuously overloads number k, initiation parameter β0；Then computation rate reduces the factor：βk=βk-1(1-0.6m)2
Wherein the packet loss difference factor is：M=Pi-Plmax
Finally, suitable transmission of flow media data speed is：Rnew=MAX { βkRi- 50, Rmin}
4) network underloading is handled.When network underloading, it is necessary to increase transmitting terminal transmission rate to increase network utilization.It is first
First calculate the packet loss difference factor：M=t (Plmin-Pi)
In formula：T represents multiplication factor；Then the computation rate increase factor：
δ=0.2emR0+60
In formula：R0For default speed growth factor.Now prediction transmission rate is：
Rnew=MIN { δ+Ri, Rmax}
In order to prevent the fine jitter of network from causing system transfer rate frequent switching, so as to cause unnecessary system to open
Pin.By setting rate switched thresholds RthTo reduce system velocity handover overhead.It is after new transmission rate is predicted, it is necessary to relatively newer
Speed RnewWith preceding first time rate adjusted value Rlast, only as | Rnew-Rlast|>RthWhen, new speed adjust is considered as just to have
Effect.
In summary, the invention provides a kind of transmission controlling party of the streaming media server limited for hardware condition
Method, the real-time and validity of streaming media are improved, transmission rate is effectively adjusted, and significantly improves QoS.
Obviously, can be with general it should be appreciated by those skilled in the art, above-mentioned each module of the invention or each step
Computing system realize that they can be concentrated in single computing system, or be distributed in multiple computing systems and formed
Network on, alternatively, they can be realized with the program code that computing system can perform, it is thus possible to they are stored
Performed within the storage system by computing system.So, the present invention is not restricted to any specific hardware and software combination.
It should be appreciated that the above-mentioned embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, without being construed as limiting the invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.In addition, appended claims purport of the present invention
Covering the whole changes fallen into scope and border or this scope and the equivalents on border and repairing
Change example.
Claims (1)
- A kind of 1. control method of message transmission rate, it is characterised in that including：Streaming media server determines QoS index, judges current network congestion situation；According to current network congestion situation, the master control that adjustment packet is sent postpones, and postponing control network using the master control gulps down The amount of telling；The QoS index includes network delay, and the master control sent according to current network congestion situation, adjustment packet Delay, postpone control network throughput using the master control, further comprise：(1) the network delay γ (1) at the 1st moment is calculated according to network delay value formula, in this, as the network delay at the 1st moment Estimate R (1), the network delay γ (2) at the 2nd moment is then calculated, the network delay for calculating for the 2nd moment by smoothing formula is estimated Evaluation, the smoothing formula are as follows：R (t)=(1- θ) R (t-1)+θ γ (t)θ is smoothing factor in formula, is the constant between 0-1；(2) network delay estimate R (t) is subjected to regularization, numbers of the network delay grade M (t) for making to calculate between 0-1 Value, the method for calculating M (t) are as follows：M (t)=R (t)/ττ postpones for tolerable maximum network in formula；(3) transmission rate is adjusted using the method based on master control delay, including：A master control delay is spaced between each two packet, or a master control delay is spaced between every two groups of packets, it is main The scope for controlling the parameter D (t) of delay is [Dl, Dh], DlAnd DhCalculation formula is as follows：Dl=Mave/MhDh=Mave/MlM in formulahAnd MlThe minimum and maximum volume of transmitted data that system is allowed respectively in the unit interval, MaveFor each or every group Data package size；(4) judgement of congestion situation：Set two congestion threshold LhAnd Ll, and 0<Ll<Lh<1, [0, Ll] idle condition is used as, [Lh, 1] and congestion condition is used as, according to different network delay grade M (t) congestion situations different with M (t-1) judgements, then Computation rate adjusting parameter d respectively, is specifically included：Situation 1：M(t)≥LhAnd M (t-1)<Lh, i.e. the t-1 moment is introduced into congestion condition, and t enters congestion condition, then passed through Increase master control postpones to reduce transmission rate：D=(Dh-Dl)·(M(t)-Lh)/(1-Lh)D (t)=min { D (t)+d, Dh}Situation 2：M(t)≥M(t-1)≥Lh, i.e. the t-1 moment has been enter into congestion condition, and t Congestion Level SPCC is more serious than the t-1 moment, Then transmission rate is reduced by increasing master control delay：D=(Dh-Dl)·(M(t)-M(t-1))/(1-Lh)D (t)=min { D (t)+d, Dh}Situation 3：M(t)<Ll, i.e. t enters idle condition, then accelerates transmission rate by reducing master control delay：D=(Dh-Dl)·(Ll-M(t))/LlD (t)=max { D (t)-d, Dl}Situation 4：If belonging to the situation outside situation 1 to situation 3, any speed adjust, i.e. D (t)=D (t) need not be made.
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| CN105407411B (en) * | 2015-10-21 | 2019-05-03 | 广州市百果园网络科技有限公司 | A kind of data transmission method for uplink and data sending device |
| CN106533959B (en) * | 2016-12-23 | 2019-07-19 | 锐捷网络股份有限公司 | The determination method and switching equipment of a kind of switching equipment outlet end rate |
| CN110505659B (en) * | 2018-05-18 | 2021-11-26 | 维沃移动通信有限公司 | Method for negotiating data transmission rate, receiving end and transmitting end |
| CN109361566A (en) * | 2018-11-13 | 2019-02-19 | 天津津航计算技术研究所 | Utilize the method for test serial number and message time stamp prediction UDP Congestion Level SPCC |
| CN110808884B (en) * | 2019-11-20 | 2022-01-28 | 中国人民解放军国防科技大学 | Network congestion control method |
| CN111193673B (en) * | 2020-04-10 | 2020-08-25 | 亮风台（上海）信息科技有限公司 | Data transmission rate control method, system and user equipment |
| CN114500682B (en) * | 2021-12-27 | 2023-08-08 | 天翼云科技有限公司 | Data packet processing method and device and side equipment |
| CN115002240B (en) * | 2022-08-04 | 2022-12-16 | 深圳市星卡软件技术开发有限公司 | Data transmission system, method, device, equipment and medium |
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