CN110505533A - A kind of method that TCP transmission of video carries out error code Retransmission control - Google Patents
A kind of method that TCP transmission of video carries out error code Retransmission control Download PDFInfo
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- CN110505533A CN110505533A CN201910614779.9A CN201910614779A CN110505533A CN 110505533 A CN110505533 A CN 110505533A CN 201910614779 A CN201910614779 A CN 201910614779A CN 110505533 A CN110505533 A CN 110505533A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
- H04N21/64738—Monitoring network characteristics, e.g. bandwidth, congestion level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64784—Data processing by the network
- H04N21/64792—Controlling the complexity of the content stream, e.g. by dropping packets
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- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Communication Control (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The invention discloses a kind of methods that TCP transmission of video carries out error code Retransmission control.Current mechanism will lead to transmission speed reduction, and a large amount of video stream data message delay is caused to reach.The method of the present invention recipient judges whether packet loss and detects error code after receiving message, if there is error code, calculates the packet loss and the bit error rate of the message.Recipient is handled according to packet loss with error condition respectively: packet loss is 0 or is less than threshold value, continues normal transmission；Packet loss is more than or equal to threshold value, and the bit error rate is less than threshold value, does not do error code and retransmits notice processing, starts congestion avoidance mechanism and slow turn-on mechanism；Packet loss and the bit error rate are all larger than equal to threshold value, after observing a period of time, are handled according to different situations, if packet loss continues normal acceleration without aggravation phenomenon, otherwise explanation exists simultaneously congestion phenomenon, slows down according to TCP rule.The method of the present invention can greatly reduce triggering network congestion, smooth network environment.
Description
Technical field
The invention belongs to fields of communication technology, and in particular to it is a kind of using Transmission Control Protocol video transmitting procedure in, to by
The packet loss caused by error code reason retransmits the error code re-transmission controlling method optimized
Background technique
TCP (transmission control protocol, Transmission Control Protocol) is a kind of connection-oriented, reliable
, transport layer communication protocol based on byte stream, be the prevailing transmission control association that current Internet environment carries out transmission of video
View provides reliable transmission service sequentially between each host.TCP congestion control is the major reason of its successful application, i.e., only
It wants terminal to be tested with loss of data, is considered caused by network congestion, then call congestion control mechanism, this is for link matter
It is suitable for measuring preferable cable environment.Congestion refers to that router reaches flow because that can not handle high-speed, and is forced to abandon number
It is believed that the phenomenon that breath.Congestion control, which refers to, prevents excessive data to be injected into network, can make the router in network in this way
Or link will not overload and generally use the mechanism such as slow turn-on, Congestion Avoidance.Wherein, slow turn-on refers to just has opened in sender's host
Begin the situation that a lower network is first detected when sending datagram, if Network status is good, sender is every to send primary literary section
The confirmation message segment of other side can correctly be received.The size of increase congestion window so just from small to large, that is, increase and send
The size of window.Congestion Avoidance refers to the growth that congestion window (cwnd) slowly increases rather than doubles, and often lives through primary
Two-way time just makes congestion window (cwnd) to increase by 1, rather than doubles, and increases cwnd slowly in this way.As long as judging network
There is congestion to be set as sending the half (>=2) of window, cwnd it is necessary to which slow turn-on is started thresholding (ssthresh)
It is set as 1, then reuses slowstart algorithm, thus host can be rapidly reduced and transmit data into network, make to gather around
The router of plug can finish the packet transaction accumulated in queue.
In the transmission of video under based on wireless environment, since wireless environment is compared with cable environment, usually have higher
Bit error rate (BER), variation bandwidth, time delay be big and frequent mobility, set traditional based on cable environment
When the TCP technology of meter is applied to wireless environment, significantly degraded performance will cause.This is because in wireless environments, losing
Caused by the reason of packet is not necessarily congestion, packet loss most of the time is undesirable by channel self character, such as signal is dry
It disturbs, multipath fading etc., or as caused by moving and switch, TCP handles packet loss caused by error code as congestion, and drops
Low packet sending speed, it is clear that be inappropriate.Therefore how packet loss reason is effectively distinguished in wireless network, and made accordingly correct anti-
The key for improving wireless network winding thread TCP transmission video flowing performance should just be become.
In congestion packet loss, congestion avoidance algorithm is called, reduces data package transmission velocity；In Wireless Losses, using aobvious
Formula retransmits, and keeps original transmission rate.
Influence of the high bit-error to TCP performance includes following two:
(1) influence of the random error to TCP: if seldom, can be restored using error correcting code；Excessive error code then may cause
Message is dropped before reaching transport layer；Cause Fast retransmission；Window is reduced, throughput reduces；
(2) time-out influence of the error burst to TCP performance: may be caused；Slow turn-on, throughput reduce；Fast retransmission is led
It causes to retransmit and loses message, reduces congestion window, throughput reduces.
Error code refers to that digital signal is inadequate by extraneous interference, the quality of route exchange device during wireless transmission
It is ideal and be distorted the signal of transmission, or since channel width not enough causes distorted signals etc., so that receiving end can not
The phenomenon that normally receiving correct message and being dropped.
Explicit Congestion notice (ECN) (RFC 3168) in Transmission Control Protocol discloses a kind of router report and response of host
Mechanism.When congestion occurs, sending host must be still in the transmission rate for reducing them.However, by avoiding losing for packet
It loses, sends host and be not necessarily to enter retransmission processes, losing sensitive data packet stream will not be greatly affected because of congestion.IP
ECN is supported using the unused field in packet header with TCP.
At network layer (IP), a transmission host allows for showing itself to carry out ECN, and router must in forwarding
It must can show that it is undergoing congestion.
At transport layer (TCP), the end TCP must show other side that itself can carry out ECN operation.Receiving end must be able to
Enough notice transmitting terminal it have received the congestion notification from router.Transmitting terminal allows for notice receiving end, and it is received
Notice from receiving end and transmission rate is reduced.
Meanwhile most importantly, this and the acceptable degree of error code can not be configured, can not adaptive video stream
The presence of the acceptable bit error rate in transmission can be reduced since a large amount of error codes retransmit the load down to network.When a large amount of error codes
When can not also judge that error code Retransmission control must be used.
There are also a kind of schemes, using Congestion Avoidance and slow turn-on mechanism, when network since mass data report can not be normal
(either due to error code or packet loss) when receiving and congestion occur, TCP can start congestion avoidance mechanism immediately, reduce and send window
Mouthful, then use slow turn-on.If occur in network the reason of congestion due to being largely delayed, packet loss, enabling congestion mechanism can
Congestion is reduced with smooth and control.But due in a wireless communication environment, packet loss (negligible amounts caused by transmission of video error code
Situation) it is image Caton or part mosaic phenomenon that of short duration influence video flowing transmits, at this moment if regarding normal congestion
Slow turn-on is started thresholding (ssthresh) immediately and is set as sending the half of window by control, and cwnd is set as 1, so
After reuse slowstart algorithm, although can rapidly reduce host in this way injects data into network, make occur congestion routing
Device can finish the packet transaction accumulated in queue, but just because of the connection-oriented characteristic of TCP, congestion control policy pole
The transmission speed for reducing the connection of some video greatly will cause a large amount of video stream data message delay and reach, to cause video
Serious delay, even serious Caton, and may grow in intensity, it gradually aggravates or even runs quickly to burst.
In existing TCP, slow turn-on mechanism and congestion avoidance mechanism are all that acceleration slowly is sent, when encountering packet loss then
Speed halves.Especially when wireless environment video transmits, the reason of may can not receive correct message is error code, Er Feiyong
Plug.So improvement is, recipient has found packet loss, passes through real-time measurement quality of wireless channel: if packet loss is lower than some threshold value
A, video quality are still endured, then in the confirmation message fed back " indicating need not retransmit ", avoid re-transmission from causing bandwidth waste, simultaneously
Error code information is prompted in the confirmation message of feedback；If packet loss is higher than threshold value A, but the bit error rate is higher than threshold value B, illustrates packet loss very
Caused by may be error code, then TCP does not slow down and does not accelerate yet, observation a period of time, if packet loss continues normal without aggravation phenomenon
Accelerate, otherwise explanation exists simultaneously congestion phenomenon, slows down according to TCP rule；If packet loss is higher than threshold value A, and the bit error rate is lower than
Threshold value B caused by illustrating that packet loss is likely due to congestion, slows down according to TCP rule is normal.
Summary of the invention
The object of the present invention is to provide a kind of methods that TCP transmission of video carries out error code Retransmission control.
Transmission of video based on TCP establishes connection, and enters normal data exchange.Due to video flowing transmission duration,
It establishes after connection unless reasons, the connections such as active break or network disconnect keep time-continuing process.In some time point, due to wireless network
There is the message of error code, error code message in the reasons such as interference, variation, the switching of network environment, the certain groupings for causing sender to send
May be it is individual, may also continuous message error code.The situation occurs, needs to carry out error code re-transmission.Error code retransmits specific control
Method is as follows:
(1) sender persistently sends message, and recipient is receiving serial number M1 message, judging whether packet loss and detect
Error code, if there is error code, then the code message number for carrying out t time window adds up S, calculates the packet loss PLR and the bit error rate of the message
SER；
T is the calculating period of time window, is set as 1 second；S is error code accumulative total, if there is error code in the t period, then S
Adding 1, S is four figures value.
(2) recipient judges packet loss and error condition, and does following processing:
Packet loss does not occur and keeps present transmission state for A.PLR=0, expression, continues normal transmission, does not do error code and retransmits notice
Processing, 6 reserved fields of TCP acknowledgment message header that recipient sends set 0 entirely；Sender receives TCP acknowledgment message, confirmation
In 6 reserved fields of message header first 2 be 00 when, determination need not retransmit.
B.PLR < τ 1, there is shown now a small amount of message error code, the influence for video flowing can receive, and keep current transmission
State continues normal transmission, does not do error code and retransmits notice processing.6 reserved fields of TCP acknowledgment message header that recipient sends
In preceding 2 position 0, expression need not retransmit, and latter 4 are S value, and error code accumulative total S carries out the tired of error code message number by t time window
Meter.τ 1 be setting packet loss threshold value, 5 × 10-4~5 × 10-3.Sender receives TCP acknowledgment message, confirmation message header 6
Position reserved field in first 2 be 00 when, determination need not retransmit.
C.PLR >=τ 1 and SER < τ 2, caused by indicating that packet loss is likely due to congestion, according to TCP congestion avoidance mechanism
It is normal to slow down, error code is not done retransmits notice processing；Preceding 2 position in 6 reserved fields of TCP acknowledgment message header that recipient sends
01, indicate that congestion is slowed down, latter 4 are S value.Sender receives TCP acknowledgment message, in 6 reserved fields of confirmation message header
First 2 when being 01, start congestion avoidance mechanism and slow turn-on mechanism.τ 2 be setting bit error rate threshold, 5 × 10-5~5 × 10-4。
There is error code in D.PLR >=τ 1 and SER >=τ 2, expression, and close to error code tolerance limit, processing method is using first at this time
Do not accelerate not slow down yet, observe a period of time k, if packet loss continues normal acceleration, otherwise explanation exists simultaneously without aggravation phenomenon
Congestion phenomenon is slowed down according to TCP rule.K is observing time window, is set as 0.5~2 second.Specific error code retransmits notice processing such as
Under:
A. when there is PLR >=τ 1 and SER >=τ 2 for the first time, 6 reserved fields of TCP acknowledgment message header of recipient's transmission
In preceding 2 position 10, indicate error code observation, latter 4 be S value, while start error code observation timing；Sender receives confirmation message
Afterwards, it does not retransmit, does not also slow down, continue normal transmission.
B. after the k period, still PLR >=τ 1 and SER >=τ 2, but PLR is not increased, indicates that packet loss without aggravation phenomenon, connects
Preceding 2 position 10 in 6 reserved fields of TCP acknowledgment message header that debit sends indicates error code observation, and latter 4 are S value, simultaneously
Start error code and observes timing；After sender receives confirmation message, continuation is not retransmitted, and is not also slowed down, and normal transmission is continued.
C. after the k period, still PLR >=τ 1 and SER >=τ 2, PLR increasing, but SER is not increased, there is shown and existing congestion adds
Acute phenomenon, preceding 2 position 01 indicates congestion deceleration in 6 reserved fields of TCP acknowledgment message header that recipient sends, and latter 4 are
S value, while starting error code observation timing；Sender from 6 reserved fields of confirmation message header first 2 be 01 when, starting is gathered around
Fill in avoidance mechanism and slow turn-on mechanism.
D. after the k period, still PLR >=τ 1 and SER >=τ 2, PLR increasing and SER are increased, there is shown existing error code aggravation
Phenomenon, and since error code is more than that threshold value influences actual use, it carries out retrieving+error code re-transmission.The TCP that recipient sends is true
Recognizing preceding 2 position 11 in 6 reserved fields of message header indicates to slow down and retransmit, and latter 4 are S value, while starting error code observation meter
When.When to analyze preceding 2 in 6 reserved fields of sender's confirmation message header be 11, starting congestion avoidance mechanism and slow turn-on machine
System, while error code re-transmission is carried out, re-transmission message number is 0.5 times of S value.
Do not start packet lost by corruption using the acceptable a small amount of error code of the method for the present invention to retransmit, triggering network can be greatly reduced and gathered around
Plug；Using message field (MFLD) transmission error code severity and reduction of speed+reissue commands are retained, it is not necessarily to overhead；It is regarded in wireless transmission
In the environment of frequency flows, the re-transmission of each video flowing will double to impact to network, and starting retransmits on demand, can smooth network
Environment.
Specific embodiment
Video flowing recipient has found packet loss, passes through real-time measurement quality of wireless channel: if packet loss is higher than given threshold, accidentally
Code rate is also above given threshold, and caused by illustrating that packet loss is likely to error code, then TCP does not slow down and do not accelerate yet, when observing one section
Between, if packet loss continues normal acceleration without aggravation phenomenon, otherwise explanation exists simultaneously congestion phenomenon, slows down according to TCP rule；
If packet loss is higher than given threshold, and the bit error rate is lower than given threshold, caused by illustrating that packet loss is likely due to congestion, according to
TCP rule is normal to slow down.
Video flowing recipient has found packet loss, passes through real-time measurement quality of wireless channel: if packet loss is lower than some threshold value, depending on
Frequently reasonable to endure, then in the confirmation message fed back " indicating need not retransmit ", avoid re-transmission from causing bandwidth waste, while anti-
Error code information is prompted in the confirmation message of feedback；The serial number of confirmation fills in the maximum fragment serial number received；But if it is higher than packet loss threshold value,
The label of " need not retransmit " is not beaten then, and the serial number of confirmation fills in the loss fragment serial number received；
Recipient has found that the bit error rate is higher than threshold value, then fills in warning information in the reserved bit of confirmation message；Sender receives
It is analyzed to confirmation message, recognizes error code warning information, if the bit error rate is higher than threshold value, taken immediate measure, adjust nothing
The measures such as line channel quality, including adjust automatically antenna direction, transmission power.
Judge that the method for the bit error rate feeds back the method for " need not retransmit " or the bit error rate using the reserved bit of confirmation message.
Transmission of video based on TCP establishes connection, and enters normal data exchange.Due to video flowing transmission duration,
It establishes after connection unless reasons, the connections such as active break or network disconnect keep time-continuing process.In some time point, due to wireless network
There is the message of error code, error code message in the reasons such as interference, variation, the switching of network environment, the certain groupings for causing sender to send
May be it is individual, may also continuous message error code.The situation occurs, needs to carry out error code re-transmission.TCP transmission of video carries out error code
The method of Retransmission control is specific as follows:
(1) sender persistently sends message, and recipient is receiving serial number M1 message, judging whether packet loss and detect
Error code, if there is error code, then the code message number for carrying out t time window adds up S, calculates the packet loss PLR and the bit error rate of the message
SER；
T is the calculating period of time window, is set as 1 second；S is error code accumulative total, if there is error code in the t period, then S
Adding 1, S is four figures value.
(2) recipient judges packet loss and error condition, and does following processing:
Packet loss does not occur and keeps present transmission state for A.PLR=0, expression, continues normal transmission, does not do error code and retransmits notice
Processing, 6 reserved fields of TCP acknowledgment message header that recipient sends set 0 entirely；Sender receives TCP acknowledgment message, confirmation
In 6 reserved fields of message header first 2 be 00 when, determination need not retransmit.
B.PLR < τ 1, there is shown now a small amount of message error code, the influence for video flowing can receive, and keep current transmission
State continues normal transmission, does not do error code and retransmits notice processing.6 reserved fields of TCP acknowledgment message header that recipient sends
In preceding 2 position 0, expression need not retransmit, and latter 4 are S value, and error code accumulative total S carries out the tired of error code message number by t time window
Meter.τ 1 be setting packet loss threshold value, 5 × 10-4~5 × 10-3, the present embodiment τ 1=0.001.Sender receives TCP acknowledgment
Message, first 2 when being 00 in 6 reserved fields of confirmation message header, determination need not be retransmitted.
C.PLR >=τ 1 and SER < τ 2, caused by indicating that packet loss is likely due to congestion, according to TCP congestion avoidance mechanism
It is normal to slow down, error code is not done retransmits notice processing；Preceding 2 position in 6 reserved fields of TCP acknowledgment message header that recipient sends
01, indicate that congestion is slowed down, latter 4 are S value.Sender receives TCP acknowledgment message, in 6 reserved fields of confirmation message header
First 2 when being 01, start congestion avoidance mechanism and slow turn-on mechanism.τ 2 be setting bit error rate threshold, 5 × 10-5~5 × 10-4, the present embodiment τ 2=0.0001.
There is error code in D.PLR >=τ 1 and SER >=τ 2, expression, and close to error code tolerance limit, processing method is using first at this time
Do not accelerate not slow down yet, observe a period of time k, if packet loss continues normal acceleration, otherwise explanation exists simultaneously without aggravation phenomenon
Congestion phenomenon is slowed down according to TCP rule.K is observing time window, is set as 0.5~2 second, the present embodiment k=1s.Specific error code
It is as follows to retransmit notice processing:
A. when there is PLR >=τ 1 and SER >=τ 2 for the first time, 6 reserved fields of TCP acknowledgment message header of recipient's transmission
In preceding 2 position 10, indicate error code observation, latter 4 be S value, while start error code observation timing；Sender receives confirmation message
Afterwards, it does not retransmit, does not also slow down, continue normal transmission.
B. after the k period, still PLR >=τ 1 and SER >=τ 2, but PLR is not increased, indicates that packet loss without aggravation phenomenon, connects
Preceding 2 position 10 in 6 reserved fields of TCP acknowledgment message header that debit sends indicates error code observation, and latter 4 are S value, simultaneously
Start error code and observes timing；After sender receives confirmation message, continuation is not retransmitted, and is not also slowed down, and normal transmission is continued.
C. after the k period, still PLR >=τ 1 and SER >=τ 2, PLR increasing, but SER is not increased, there is shown and existing congestion adds
Acute phenomenon, preceding 2 position 01 indicates congestion deceleration in 6 reserved fields of TCP acknowledgment message header that recipient sends, and latter 4 are
S value, while starting error code observation timing；Sender from 6 reserved fields of confirmation message header first 2 be 01 when, starting is gathered around
Fill in avoidance mechanism and slow turn-on mechanism.
D. after the k period, still PLR >=τ 1 and SER >=τ 2, PLR increasing and SER are increased, there is shown existing error code aggravation
Phenomenon, and since error code is more than that threshold value influences actual use, it carries out retrieving+error code re-transmission.The TCP that recipient sends is true
Recognizing preceding 2 position 11 in 6 reserved fields of message header indicates to slow down and retransmit, and latter 4 are S value, while starting error code observation meter
When.When to analyze preceding 2 in 6 reserved fields of sender's confirmation message header be 11, starting congestion avoidance mechanism and slow turn-on machine
System, while error code re-transmission is carried out, re-transmission message number is 0.5 times of S value.
Claims (3)
1. a kind of method that TCP transmission of video carries out error code Retransmission control, which is characterized in that control method is specific as follows:
(1) sender persistently sends message, and recipient is receiving serial number M1 message, judge whether packet loss and detecting error code,
If there is error code, then the code message number for carrying out t time window adds up S, calculates the packet loss PLR and bit error rate SER of the message；
T is the calculating period of time window, is set as 1 second；S is error code accumulative total, and if there is error code in the t period, then S adds 1,
S is four figures value；
(2) recipient judges packet loss and error condition, and does following processing:
Packet loss does not occur and keeps present transmission state for A.PLR=0, expression, continues normal transmission, does not do error code and retransmits at notice
Reason, 6 reserved fields of TCP acknowledgment message header that recipient sends set 0 entirely；Sender receives TCP acknowledgment message, confirmation report
In 6 reserved fields of literary header first 2 be 00 when, determination need not retransmit；
B.PLR < τ 1, there is shown now a small amount of message error code, the influence for video flowing can receive, and keep present transmission state,
Continue normal transmission, does not do error code and retransmit notice processing；In 6 reserved fields of TCP acknowledgment message header that recipient sends
Preceding 2 position 0, expression need not retransmit, and latter 4 are S value, and error code accumulative total S carries out the accumulative of error code message number by t time window；τ1
For the packet loss threshold value of setting；Sender receives TCP acknowledgment message, and first 2 are 00 in 6 reserved fields of confirmation message header
When, determination need not retransmit；
C.PLR >=τ 1 and SER < τ 2 are normal according to TCP congestion avoidance mechanism caused by indicating that packet loss is likely due to congestion
Slow down, does not do error code and retransmit notice processing；Preceding 2 position 01 in 6 reserved fields of TCP acknowledgment message header that recipient sends,
Indicate that congestion is slowed down, latter 4 are S value；Sender receives TCP acknowledgment message, preceding 2 in 6 reserved fields of confirmation message header
When position is 01, start congestion avoidance mechanism and slow turn-on mechanism；τ 2 is the bit error rate threshold of setting；
There is error code in D.PLR >=τ 1 and SER >=τ 2, expression, and close to error code tolerance limit, processing method is used and is first not added at this time
Speed is not also slowed down, and a period of time k is observed, if packet loss without aggravation phenomenon, continues normally to accelerate, otherwise explanation exists simultaneously congestion
Phenomenon is slowed down according to TCP rule；K is observing time window；It is as follows that specific error code retransmits notice processing:
A. when for the first time there is PLR >=τ 1 and SER >=τ 2 when, recipient send 6 reserved fields of TCP acknowledgment message header in front of
2 positions 10 indicate error code observation, and latter 4 are S value, while starting error code observation timing；After sender receives confirmation message, no
It retransmits, does not also slow down, continue normal transmission；
B. after the k period, still PLR >=τ 1 and SER >=τ 2, but PLR is not increased, indicates packet loss without aggravation phenomenon, recipient
Preceding 2 position 10 in 6 reserved fields of TCP acknowledgment message header of transmission indicates error code observation, and latter 4 are S value, starts simultaneously
Error code observes timing；After sender receives confirmation message, continuation is not retransmitted, and is not also slowed down, and normal transmission is continued；
C. after the k period, still PLR >=τ 1 and SER >=τ 2, PLR increasing, but SER is not increased, there is shown and existing congestion aggravation is existing
As, preceding 2 position 01 indicates that congestion is slowed down in 6 reserved fields of TCP acknowledgment message header that recipient sends, and latter 4 are S value,
Start error code observation timing simultaneously；Sender from 6 reserved fields of confirmation message header first 2 be 01 when, starting congestion keep away
Exempt from mechanism and slow turn-on mechanism；
D. after the k period, still PLR >=τ 1 and SER >=τ 2, PLR increasing and SER are increased, there is shown and existing error code aggravates phenomenon,
And since error code is more than that threshold value influences actual use, carry out retrieving+error code re-transmission；The TCP acknowledgment report that recipient sends
Preceding 2 position 11 indicates to slow down and retransmit in 6 reserved fields of literary header, and latter 4 are S value, while starting error code observation timing；
When to analyze preceding 2 in 6 reserved fields of sender's confirmation message header be 11, starting congestion avoidance mechanism and slow turn-on machine
System, while error code re-transmission is carried out, re-transmission message number is 0.5 times of S value.
2. the method that a kind of TCP transmission of video as described in claim 1 carries out error code Retransmission control, it is characterised in that: 1 > τ of τ
2, τ 1=5 × 10-4~5 × 10-3, 2=5 × 10 τ-5~5 × 10-4。
3. the method that a kind of TCP transmission of video as described in claim 1 carries out error code Retransmission control, it is characterised in that: k=
0.5~2s.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112492646A (en) * | 2020-11-27 | 2021-03-12 | 清华大学 | Congestion control method and device based on congestion cause identification |
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