CN103825689A - Delay determinacy message retransmission method with local cache - Google Patents
Delay determinacy message retransmission method with local cache Download PDFInfo
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Abstract
The invention provides a delay determinacy message retransmission method with a local cache. A receiving end requests data which needs retransmitted from a sending end unequivocally, and information of more than one lost data section is included in a request. The local cache is arranged, lost messages can be subjected to local retransmission, and accordingly the phenomenon of packet loss of a reverse link ACK can be avoided. The method is a strategy through which loss restoring is carried out quickly with limited bandwidth, on a channel with large delay and error rate and asymmetric link bandwidth, the frequency and the amount of message retransmission are reduced, and the problem of channel efficiency lowering during packet loss caused by reverse channel bandwidth limiting on the channel is avoided. By arranging the local cache, the problem that channel transmission efficiency is low due to large delay when reverse ACK messages are lost can be solved. According to the method, satellite link message retransmission efficiency can be greatly improved, and satellite channel using rate is greatly improved.
Description
Technical field
The present invention relates to a kind of delay certainty message retransmission method with local cache.
Background technology
Because satellite link has the advantages that propagation delay is long, bandwidth time delay is long-pending greatly, the error rate is high, cause Transmission Control Protocol performance in the time being applied to satellite link of extensive use in the Internet to be greatly affected, seriously limited the utilization of satellite link resource, efficiency of transmission cannot meet miscellaneous service demand.Transmission Control Protocol, transmission control protocol, is the agreement that a kind of feedback is replied, receiving terminal can return to transmitting terminal by ACK message by data receiver situation, especially in the time of link error code or network congestion generation message dropping, transmitting terminal can be understood packet drop according to ACK information, triggers message and retransmits.And in satellite link, larger time delay makes above-mentioned retransmission efficiency very low, because the ACK information that tradition is used can only comprise the place's mistake in a transmission window, if wrapping in a window, TCP there are multiple mistakes, we have to send multiple ACK information notice transmitting terminals so, this is subject to strict restriction for up channel, and uplink downlink Capacity Ratio is very disadvantageous beyond doubt the nonsymmetric channel between 1:1000 at 1:10.
For the problems referred to above, a kind of delay certainty message retransmission method with local cache is proposed.
Summary of the invention
The object of this invention is to provide a kind of delay certainty message retransmission method with local cache solve in prior art, exist in satellite link, larger time delay makes the retransmission efficiency after message dropping very low, because the ACK information that tradition is used can only comprise the place's mistake in a transmission window, if wrapping in a window, TCP there are multiple mistakes, we have to send multiple ACK information notice transmitting terminals so, this is subject to strict restriction for up channel, uplink downlink Capacity Ratio is undoubtedly very disadvantageous problem the nonsymmetric channel between 1:1000 at 1:10.
The invention provides a kind of delay certainty message retransmission method with local cache, the message retransmission efficiency that solution satellite link long delay causes is low, and channel resource is wasted serious problem.
Technical solution of the present invention is:
There is a delay certainty message retransmission method for local cache,
The concrete packet drop of recorded message transmission, in the time there is packet loss, receiving terminal sends certainty repeat requests to transmitting terminal, the message that request transmission is lost, the information of carrying one or more loss messages in this request;
Message to new loss arranges retransmission delay, and while there is new message dropping, after retransmission delay, receiving terminal sends request the new message of losing of transmission to transmitting terminal;
At satellite link receiving terminal gateway, local cache is set, when the reverse link ACK transmission that receiving node sends is lost, retransmits message by receiving terminal gateway.
Preferably, certainty repeat requests option connects process of establishing by TCP and activates, this certainty repeat requests option is arranged in the Option Field of TCP header, and this certainty repeat requests option of activation is determined in the negotiation of putting by transmitting-receiving two-end in the time setting up TCP connection;
If the two ends that TCP connects have all been used certainty repeat requests option in the SYN of TCP head section, certainty repeat requests option will be activated so, if certainty repeat requests is not supported in any one end in the two ends that TCP connects, conventional ACK or time delay ACK will be used so.
Preferably, receive the whether correct information of data queue's recorded message, receiving terminal utilizes bit vector in an ACK message, to represent the information of multiple loss messages;
In the reception data queue of data receiver, record the correct or wrong information of data receiver, in the time there is error message in queue, receiving terminal adopts bit vector to represent the information of multiple loss messages, issues data sending terminal by replying ACK message.
Preferably, while there is new message dropping, retransmission delay is set, does not send immediately response message ACK, but postpone after a period of time, at the bright all packet drops that occur in during this period of time of bit vector acceptance of the bid, unify to return to data sending terminal.
Preferably, local cache is set, to prevent the loss of reverse link ACK transmission.At G2 gateway, local cache is set, the message of H2 is mail in storage, when the reverse link ACK sending as H2 loses, carries out this locality retransmit by G2, saves the time of packet loss repeating transmission.
Preferably, if certainty repeat requests is lost in the time of transmission, data receiver is retransmitted this request.
Preferably, the step that initiation certainty message retransmits is described below:
Step 1: transmitting terminal arranges certainty message and retransmits option in tcp header option, initiates connection request to receiving terminal, SYN(is set in header synchronous) mark;
Step 2: receiving terminal is received connection request, if protocol stack is supported the processing of this option, goes to step three, otherwise goes to step four;
Step 3: receiving terminal arranges certainty message and retransmits option in tcp header option, initiates to connect to transmitting terminal and replys, in header, arrange SYN/ACK(synchronous/reply) mark, represent to accept the use of this option;
Step 4: receiving terminal is initiated to connect to transmitting terminal and replied, in header, arrange SYN/ACK(synchronous/reply) mark, represent not accept the use of this option;
Step 5: finish.
Preferably, receiving terminal is described below to the step of transmitting terminal transmission certainty message retransmission information:
Step 1: receiving terminal checks the message dropping situation of receiving queue;
Step 2: receiving terminal is filled in header information according to packet drop, the types value that certainty message retransmits in option is set to 21; Fill in length value, the 1st place's mistake side-play amount, the 1st place's incorrect length value and bit vector;
Step 3: receiving terminal sends response message when retransmission delay clock is overtime;
Step 4: finish.
Preferably, the step of certainty repeat requests receiving terminal processing is described below:
Step 1: the 1st place's mistake in transmission certainty repeat requests;
Step 2: retransmit by bit vector ascending order, certainty repeat requests bit vector order moves to left until retransmitted 1 MSS data segment of 0 correspondence in last 1 left side;
Step 3: finish.
The invention provides a kind of message retransmission method on satellite link, there is the certainty retransmission request method (DSACK) of local cache, in the method, data receiver clearly asks to need the data of repeating transmission to transmitting terminal, and in request, can comprise the information of a more than obliterated data section.Local cache is set, can carries out this locality to the message of losing and retransmit, thereby prevent that reverse link ACK from packet loss phenomenon occurring.The method is to utilize finite bandwidth to carry out quickly the one strategy of loss recovery, therefore, just seems extremely important for long delay network.
The invention has the beneficial effects as follows: a kind of delay certainty message retransmission method with local cache of the present invention, the concrete packet drop of receiving terminal recorded message transmission, in the time there is packet loss, receiving terminal only transmits the message of loss to transmitting terminal request, and the information that can carry multiple loss messages in once asking.This kind has the delay certainty message retransmission method of local cache, can have on the asymmetric channel of long time delay, the error rate and link bandwidth, reduce frequency and quantity that message retransmits, the problem that while avoiding causing packet loss due to backward channel Bandwidth-Constrained on such channel, channel efficiency declines.Simultaneously by local cache is set, can solve reverse ACK message dropping time, the low problem of channel transport efficiency causing due to long time delay.The method can improve satellite link message retransmission efficiency greatly, and satellite channel utilance is significantly improved.
Accompanying drawing explanation
Fig. 1 is the network environment schematic diagram of the embodiment of the present invention;
Fig. 2 is three certainty repeat requests data sections that use bit vector to produce in the embodiment of the present invention;
Fig. 3 is the data sequence schematic diagram of TCP receiving terminal in the embodiment of the present invention;
Fig. 4 is that in the embodiment of the present invention, receiving terminal sends the flow chart that re-transmission is replied.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
The method that the present embodiment is described is applied in network environment as shown in Figure 1.Wherein the connection between user H1 and H2 comprises one section of satellite link, utilizes gateway station G1 with G2, satellite link to be separated with terrestrial links, and whole connection is divided into three sections, has adopted different protocol processes methods.Message retransmission method in the present embodiment is just applied to satellite link section and connects on 2.
As shown in Figure 2, in figure, be the data queue of data receiver order of occurrence mistake, according to the requirement of certainty repeat requests option data section, adopt bit vector to send certainty repeat requests.In Fig. 2, in the buffer queue of receiving terminal, there are three place's mistakes, first place's mistake has just occurred at once in the time receiving previous ACK, therefore its side-play amount is 0, taken the length of 2 MSS, the side-play amount of the current ACK of second place's mistake nidus distance is 8, takies 2 MSS length, the side-play amount of the 3rd place's mistake is 12, takies 1 MSS length.
The certainty number of retransmission requests being produced by data receiver is according to section, as shown in Figure 3.It should be noted that, type is constant 21, and in TCP packet header, special secondary school refers to certainty repeat requests; Length refers to that 6 bytes of certainty repeat requests option add 2 bytes of its bit vector, totally 8 bytes; Five 0 of last 1 rear benefit are eight in order to gather together enough a byte.
Receiving terminal transmission retransmits the flow process of replying and sees Fig. 4.
A kind of delay certainty message retransmission method with local cache of embodiment, the concrete packet drop transmitting by recorded message, in the time there is packet loss, receiving terminal sends certainty repeat requests to transmitting terminal, the message that request transmission is lost, the information of carrying one or more loss messages in this request; Message to new loss arranges retransmission delay, and while there is new message dropping, after retransmission delay, receiving terminal sends request the new message of losing of transmission to transmitting terminal; At satellite link receiving terminal gateway, local cache is set, when the reverse link ACK transmission that receiving node sends is lost, retransmits message by receiving terminal gateway.
Certainty repeat requests option connects process of establishing by TCP and activates, and this certainty repeat requests option is arranged in the Option Field of TCP header, and this certainty repeat requests option of activation is determined in the negotiation of putting by transmitting-receiving two-end in the time setting up TCP connection; If the two ends that TCP connects have all been used certainty repeat requests option in the SYN of TCP head section, certainty repeat requests option will be activated so, if certainty repeat requests is not supported in any one end in the two ends that TCP connects, conventional ACK or time delay ACK will be used so.
Receive the whether correct information of data queue's recorded message, receiving terminal utilizes bit vector in an ACK message, to represent the information of multiple loss messages; In the reception data queue of data receiver, record the correct or wrong information of data receiver, in the time there is error message in queue, receiving terminal adopts bit vector to represent the information of multiple loss messages, issues data sending terminal by replying ACK message;
While there is new message dropping, retransmission delay is set, does not send immediately response message ACK, but postpone after a period of time, at the bright all packet drops that occur in during this period of time of bit vector acceptance of the bid, unify to return to data sending terminal;
At G2 gateway, local cache is set, the message of H2 is mail in storage, when the reverse link ACK sending as H2 loses, carries out this locality retransmit by G2, saves the time of packet loss repeating transmission.
If certainty repeat requests is lost in the time of transmission, data receiver is retransmitted this request.
The step of initiating the re-transmission of certainty message is described below:
Step 1: transmitting terminal arranges certainty message and retransmits option in tcp header option, initiates connection request to receiving terminal, SYN(is set in header synchronous) mark;
Step 2: receiving terminal is received connection request, if protocol stack is supported the processing of this option, goes to step three, otherwise goes to step four;
Step 3: receiving terminal arranges certainty message and retransmits option in tcp header option, initiates to connect to transmitting terminal and replys, in header, arrange SYN/ACK(synchronous/reply) mark, represent to accept the use of this option;
Step 4: receiving terminal is initiated to connect to transmitting terminal and replied, in header, arrange SYN/ACK(synchronous/reply) mark, represent not accept the use of this option;
Step 5: finish.
Receiving terminal is described below to the step of transmitting terminal transmission certainty message retransmission information:
Step 1: receiving terminal checks the message dropping situation of receiving queue;
Step 2: receiving terminal is filled in header information according to packet drop, the types value that certainty message retransmits in option is set to 21; Fill in length value, the 1st place's mistake side-play amount, the 1st place's incorrect length value and bit vector;
Step 3: receiving terminal sends response message when retransmission delay clock is overtime;
Step 4: finish.
Preferably, the step of certainty repeat requests receiving terminal processing is described below:
Step 1: the 1st place's mistake in transmission certainty repeat requests;
Step 2: retransmit by bit vector ascending order, certainty repeat requests bit vector order moves to left until retransmitted 1 MSS data segment of 0 correspondence in last 1 left side;
Step 3: finish.
Certainty repeat requests option is positioned at TCP header part, and certainty repeat requests option comprises following data segment, as shown in Figure 3:
Type: this field is a byte that must use while using certainty repeat requests, is first byte of certainty repeat requests option, and its value is 21;
Length: being second byte of certainty repeat requests option, is the shared byte number of certainty repeat requests option, comprises the bit vector of certainty repeat requests, and the length value of standard is the length that 6 bytes add bit vector;
The 1st place's mistake side-play amount: this field takies two bytes, is third and fourth byte of certainty repeat requests option, and this value has been pointed out the side-play amount between first mistake and the current ACK receiving in receiving terminal data queue.Its unit is MSS(Maximum Segment Size maximum segment size), can simply calculate by following formula.
Mistake 1 side-play amount=(offset sequence value-ACK value)/(1 byte number that MSS comprises)
The 1st place's incorrect length: this field takies two bytes is the 5th, six bytes of certainty repeat requests option.This field represents the length of above-mentioned first error of transmission section, has provided mistake and has altogether accounted for how many bytes, and its unit is MSS.Be calculated as follows:
The byte number that mistake 1 length=mistake 1 byte number/1 MSS comprises.
Certainty repeat requests bit vector: after bit vector mistake 1 length field, take continuous byte, it comprised remaining detected be present in the mistake in receiving queue, the byte number therefore taking will change with number of errors.Bit vector forms by 0 and 1, and the data block of 0 this MSS size in position of expression is lost, and 1 expression successfully receives.If eight of less thaies are in the end mended 0 after one 1 and are supplied eight, and 0 data that do not represent loss herein.
Claims (9)
1. a delay certainty message retransmission method with local cache, is characterized in that:
The concrete packet drop of recorded message transmission, in the time there is packet loss, receiving terminal sends certainty repeat requests to transmitting terminal, the message that request transmission is lost, the information of carrying one or more loss messages in this request;
Message to new loss arranges retransmission delay, and while there is new message dropping, after retransmission delay, receiving terminal sends request the new message of losing of transmission to transmitting terminal;
At satellite link receiving terminal gateway, local cache is set, when the reverse link ACK transmission that receiving node sends is lost, retransmits message by receiving terminal gateway.
2. the delay certainty message retransmission method with local cache as claimed in claim 1, it is characterized in that: certainty repeat requests option connects process of establishing by TCP and activates, this certainty repeat requests option is arranged in the Option Field of TCP header, and this certainty repeat requests option of activation is determined in the negotiation of putting by transmitting-receiving two-end in the time setting up TCP connection;
If the two ends that TCP connects have all been used certainty repeat requests option in the SYN of TCP head section, certainty repeat requests option will be activated so, if certainty repeat requests is not supported in any one end in the two ends that TCP connects, conventional ACK or time delay ACK will be used so.
3. the delay certainty message retransmission method with local cache as claimed in claim 1, is characterized in that: receive the whether correct information of data queue's recorded message, receiving terminal utilizes bit vector in an ACK message, to represent the information of multiple loss messages;
In the reception data queue of data receiver, record the correct or wrong information of data receiver, in the time there is error message in queue, receiving terminal adopts bit vector to represent the information of multiple loss messages, issues data sending terminal by replying ACK message.
4. the delay certainty message retransmission method with local cache as claimed in claim 1, it is characterized in that: while there is new message dropping, retransmission delay is set, do not send immediately response message ACK, but postpone after a period of time, at the bright all packet drops that occur in during this period of time of bit vector acceptance of the bid, unify to return to data sending terminal.
5. the delay certainty message retransmission method with local cache as claimed in claim 1, is characterized in that: at G2 gateway, local cache is set, the message of H2 is mail in storage, when the reverse link ACK sending as H2 loses, carries out this locality repeating transmission by G2.
6. the delay certainty message retransmission method with local cache as described in claim 1-5 any one, is characterized in that: if certainty repeat requests is lost in the time of transmission, data receiver is retransmitted this request.
7. the delay certainty message retransmission method with local cache as described in claim 1-5 any one, is characterized in that: the step of initiating the re-transmission of certainty message is described below:
Step 1: transmitting terminal arranges certainty message and retransmits option in tcp header option, initiates connection request to receiving terminal, and SYN mark is set in header;
Step 2: receiving terminal is received connection request, if protocol stack is supported the processing of this option, goes to step three, otherwise goes to step four;
Step 3: receiving terminal arranges certainty message and retransmits option in tcp header option, initiates to connect to transmitting terminal and replys, and SYN/ACK mark is set in header, represents to accept the use of this option;
Step 4: receiving terminal is initiated to connect to transmitting terminal and replied, and SYN/ACK mark is set in header, represents not accept the use of this option;
Step 5: finish.
8. the delay certainty message retransmission method with local cache as described in claim 1-5 any one, is characterized in that: receiving terminal is described below to the step of transmitting terminal transmission certainty message retransmission information:
Step 1: receiving terminal checks the message dropping situation of receiving queue;
Step 2: receiving terminal is filled in header information according to packet drop, the types value that certainty message retransmits in option is set to 21; Fill in length value, the 1st place's mistake side-play amount, the 1st place's incorrect length value and bit vector;
Step 3: receiving terminal sends response message when retransmission delay clock is overtime;
Step 4: finish.
9. the delay certainty message retransmission method with local cache as described in claim 1-5 any one, is characterized in that: the step of certainty repeat requests receiving terminal processing is described below:
Step 1: the 1st place's mistake in transmission certainty repeat requests;
Step 2: retransmit by bit vector ascending order, certainty repeat requests bit vector order moves to left until retransmitted 1 MSS data segment of 0 correspondence in last 1 left side;
Step 3: finish.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106797281A (en) * | 2014-12-24 | 2017-05-31 | 柏思科技有限公司 | For the method and system by the connection transmission data that are polymerized |
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| CN112865926A (en) * | 2021-02-04 | 2021-05-28 | 中汽创智科技有限公司 | End-to-end safety communication fault-tolerant method and system |
| CN113328958A (en) * | 2021-05-06 | 2021-08-31 | 北京连山科技股份有限公司 | Multi-link mass transmission method and system based on UDP (user Datagram protocol) cache optimization |
| CN113328958B (en) * | 2021-05-06 | 2022-03-11 | 北京连山科技股份有限公司 | Multi-link mass transmission method and system based on UDP (user Datagram protocol) cache optimization |
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