CN103825832A - Packet loss sensing distinguishing type congestion control method - Google Patents
Packet loss sensing distinguishing type congestion control method Download PDFInfo
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- CN103825832A CN103825832A CN201410074062.7A CN201410074062A CN103825832A CN 103825832 A CN103825832 A CN 103825832A CN 201410074062 A CN201410074062 A CN 201410074062A CN 103825832 A CN103825832 A CN 103825832A
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Abstract
The invention provides a packet loss sensing distinguishing type congestion control method. The method includes the steps of distinguishing congestion, error codes and link disconnection according to the link state detected through a link layer, informing a source end of congestion, error codes and link disconnection through different types of signaling, and enabling the source end to renew local state information, and for different packet loss types, utilizing a preset default processing mode when packet loss causes can not be recognized through a distinguishing type congestion control mechanism. According to the packet loss sensing distinguishing type congestion control method, three different packet loss types in a satellite link can be distinguished, different types of congestion control can be conducted for different causes, and the problems that congestion and error code packet loss exist in the satellite link, and efficiency of the congestion control mechanism is low due to TCP linkage interruption caused when the satellite link is shielded or the link is interrupted due to movement of the terminal are solved. The adaptability of the congestion control mechanism in the satellite link is enhanced, and the link throughput and the channel efficiency are greatly improved.
Description
Technical field
The present invention relates to a kind of differentiation type jamming control method of packet loss perception.
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, cause satellite network efficiency of transmission not high, seriously limited the utilization of satellite link resource, efficiency of transmission cannot meet miscellaneous service demand.
The error rate of satellite channel is approximately
the order of magnitude, this wired medium that is above the ground level far away.The various enchancement factors of space channel (like rain declining etc.) make channel occur link degradation in addition, and the satellite link that the error rate is relatively high has reduced the performance of TCP widely.Because TCP is a loss sensitive protocol of controlling transport behavior with packet loss, it cannot distinguish congestion loss or link degradation burst error is lost.TCP supposition message dropping is all caused by channel congestion, and the larger error rate has triggered prematurely window and reduced mechanism, although at this moment network is not congested, meanwhile, the loss of ACK grouping further worsens throughput.In addition, satellite link runs into when blocking or making link down due to fast mobile terminal, and connection breaking during TCP also understands, has affected terminal use's use.For this problem, a kind of differentiation type jamming control method of packet loss perception is proposed, distinguish the different packet loss type in link.
Summary of the invention
The object of this invention is to provide a kind of differentiation type jamming control method of packet loss perception, solve and exist in prior art: the larger error rate of satellite link does not occur when congested and trigger prematurely window and reduce mechanism, ACK packet loss further worsens throughput, and satellite link runs into TCP disconnecting when blocking or making link down due to fast mobile terminal and affects the problem that terminal use uses.
Technical solution of the present invention is:
A kind of differentiation type jamming control method of packet loss perception, by utilizing Link State that link layer detects to distinguish congested, error code and link disconnects, congested, error code and link are disconnected respectively by dissimilar signaling source, make source upgrade local state information;
To different packet loss types, adopt differentiation type congestion control mechanism, when None-identified packet loss reason, adopt default default process pattern.
Preferably, to different packet loss types, sending node will adopt corresponding response mode;
For congestion packet loss, adopt the VJ mechanism of TCP standard to process, transmission rate is reduced by half, and re-transmission clock is doubled;
For packet lost by corruption, do not change transmission rate, retransmission time out value also remains unchanged, and congestion control mechanism is converted to Vegas mechanism simultaneously;
In the time there is the phenomenon of disconnection in link, will stop sending any new data, stop retransmitting clock, periodically whether detecting link recovers simultaneously, when source is received an indication, while showing that opposite end has recovered to connect, will recover to run well.
Preferably, obtain the available information of link by data link layer signaling from link-local interface;
The state information of maintenance link availability, in the time that Link State changes, to sending change information from the nearest upstream neighbor node of this link;
Data source is known this change information.
Preferably, the message queue size by monitoring node place changes and regularly sends that probe messages is distinguished congested, error code and link disconnects;
In the time there is message dropping, if when message queue size exceedes threshold value p, be judged as congested;
If message queue size does not reach threshold value p, be judged as error code;
If while there is packet loss, the probe messages regularly sending is not received response in time-out time, is judged as link and disconnects.
Preferably, packet loss reason determining step is described below:
Step 1: find that there is message dropping phenomenon, check that whether probe messages is overtime, if overtime, go to step three; If do not have overtimely, go to step two;
Step 2: the queue length in node buffering area is less than p, show that packet loss is former because link error code; If queue length is greater than p, packet loss is former because link congestion;
Step 3: providing packet loss reason is that link disconnects.
Preferably, when transmit leg cannot judge packet loss type, transmit leg will adopt default congestion processing method, be that congestion control mechanism is set to VJ mechanism, transmission rate is reduced by half, retransmission time out value doubles simultaneously, namely in default situation, processes according to congestion packet loss.
Preferably, according to packet loss cause information, send corresponding notice message to contiguous upstream node.
Preferably, notice message is for send the information of message dropping reason to adjacent upstream node, so that sending node is taked corresponding congestion control policy according to different packet loss reasons.
Preferably, sending the corresponding step of notifying message according to different packet loss reasons is described below:
Step 1: judge the link disconnection if of packet loss reason, send link and disconnect notice to adjacent upstream node;
Step 2: judge packet loss reason link congestion if, send link congestion and notify to adjacent upstream node;
Step 3: judge packet loss reason link error code if, send link error code and notify to adjacent upstream node.
The step of preferably, differentiation type congestion control mechanism is described below:
Step 1: if packet loss type is congestion packet loss, transmission rate is reduced by half, retransmission time out value doubles, it is VJ mechanism that congestion control mechanism is set, and forwards step 5 to;
Step 2: if packet loss type is packet lost by corruption, transmission rate is constant, retransmission time out value is constant, and congestion control mechanism is set to Vegas mechanism, forwards step 5 to;
Step 3: disconnect if packet loss type is link, stop sending data, stop retransmitting clock, and go to step four;
Step 4: periodically send probe messages, check whether link recovers, if recovered, continue to send message, if do not recovered, constantly survey;
Step 5: finish.
VJ mechanism is the congestion control mechanism of a kind of TCP of proposing in the paper of 1988 of V. Jacobson, is made up of " slow start (Slow start) " and " Congestion Avoidance (Congestion avoidance) " algorithm.
Vegas mechanism is for large bandwidth high latency link, the one of conventional TCP congestion control to be improved mechanism, and mainly re-transmission, congestion detection and slow Initiated Mechanism is improved.
The invention has the beneficial effects as follows: the differentiation type jamming control method of having invented a kind of packet loss perception, three kinds of different packet loss type classifications in satellite link can be come, and carry out different congestion control processing for different reasons, solve satellite link and had congested and packet lost by corruption, and satellite link runs into when blocking or making link down due to fast mobile terminal, the inefficient problem of congestion control mechanism that TCP disconnecting causes.Strengthen the adaptability of congestion control mechanism in satellite link, greatly improved link throughput and channel efficiency.
Accompanying drawing explanation
Fig. 1 is the flow chart of packet loss reason judgement in the embodiment of the present invention;
Fig. 2 is the flow chart that sends notice message in the embodiment of the present invention according to different packet loss reason;
Fig. 3 is the schematic diagram of notifying the data format of message in the embodiment of the present invention;
Fig. 4 is the flow chart that carries out differentiation type congestion control in the embodiment of the present invention according to different packet loss type.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
As shown in Figure 4, the present embodiment provides a kind of differentiation type jamming control method of packet loss perception, by utilizing Link State that link layer detects to distinguish congested, error code and link disconnects, congested, error code and link are disconnected respectively by dissimilar signaling source, make source upgrade local state information; To different packet loss types, adopt differentiation type congestion control mechanism, when None-identified packet loss reason, adopt default default process pattern.
In packet loss perception mechanism, a monitoring modular and notification module are comprised, utilize Link State that link layer detects to distinguish congested, error code and link disconnects, and congested, error code and link are disconnected respectively by dissimilar signaling source, make it to upgrade local state information.In addition, in some cases, if this mechanism None-identified packet loss reason, the default process pattern that employing is pre-set.Monitoring modular relies on from link-local interface, as satellite channel interface, obtains the available information of link by data link layer signaling.Meanwhile, notification module, by the state information of maintenance link availability, comprises available, unavailable.In the time that Link State changes, notification module is by sending change information from the nearest upstream neighbor node of this link.Afterwards, data source will be known this information.
As shown in Figure 1, monitoring modular is arranged on a software module of network node link layer, and the message queue size by monitoring node place changes and regularly sends that probe messages is distinguished congested, error code and link disconnects.Occurring when message dropping, if when message queue size exceedes threshold value p, be judged as congestedly, because now resources in network is limited, cannot process too much message, thereby cause network node to overstock too much message; If message queue size does not reach threshold value p, be judged as error code.If while there is packet loss, the probe messages regularly sending is not received response in time-out time, is judged as link and disconnects.
The step of packet loss reason judgement is described below:
Step 1: find that there is message dropping phenomenon, check that whether probe messages is overtime, if overtime, go to step three; If do not have overtimely, go to step two;
Step 2: the queue length in node buffering area is less than p, show that packet loss is former because link error code; If queue length is greater than p, packet loss is former because link congestion;
Step 3: providing packet loss reason is that link disconnects.
As shown in Figure 2, notification module is arranged on a software module of network node link layer equally, and the packet loss cause information providing according to monitoring modular sends different notice messages to contiguous upstream node.
The step that sends corresponding notice message according to different packet loss reasons is described below:
Step 1: judge the link disconnection if of packet loss reason, send link and disconnect notice to adjacent upstream node;
Step 2: judge packet loss reason link congestion if, send link congestion and notify to adjacent upstream node;
Step 3: judge packet loss reason link error code if, send link error code and notify to adjacent upstream node;
The formal definition of notice message: the notice message that notification module sends is mainly used in sending to adjacent upstream node the information of message dropping reason, thereby makes sending node take different congestion control policies according to different packet loss reasons.This notice message adopts UDP message to send, and its data format definition as shown in Figure 3.
Wherein, packet loss type definition is:
Link congestion: 0x01;
Link error code: 0x02;
Link disconnects: 0x03;
Differentiation type congestion control mechanism: for three kinds of different packet loss types, sending node will adopt respectively three kinds of different response modes.For congestion packet loss, adopt the VJ mechanism of TCP standard to process, transmission rate is reduced by half, and re-transmission clock is doubled; Do not change transmission rate for packet lost by corruption, retransmission time out value also remains unchanged, and congestion control mechanism is converted to Vegas mechanism simultaneously.In the time that the phenomenon of disconnection occurs satellite link, equipment will stop sending any new data, stop retransmitting clock; Periodically whether detecting link recovers simultaneously.These probe message can realize by the message that comprises a byte data, also can realize by response message.When source is received an indication, while showing that opposite end has recovered to connect, will recover to run well, the indication here can be the new message by receiving from opposite end, can be also the link-recovery signaling in informing mechanism.This machine-processed handling process as shown in Figure 4.
The concrete steps of differentiation type congestion control mechanism are described below:
Step 1: if packet loss type is congestion packet loss, transmission rate is reduced by half, retransmission time out value doubles, it is VJ mechanism that congestion control mechanism is set, and forwards step 5 to;
Step 2: if packet loss type is packet lost by corruption, transmission rate is constant, retransmission time out value is constant, and congestion control mechanism is set to Vegas mechanism, forwards step 5 to;
Step 3: disconnect if packet loss type is link, stop sending data, stop retransmitting clock, and go to step four;
Step 4: periodically send probe messages, check whether link recovers, if recovered, continue to send message, if do not recovered, constantly survey;
Step 5: finish.
In some cases, transmit leg cannot judge packet loss type, as packet loss reason notice message dropping, message itself is because error code causes information None-identified etc., now, transmit leg will adopt default congestion processing method, and congestion control mechanism is set to VJ mechanism, transmission rate is reduced by half, retransmission time out value doubles simultaneously.Namely in default situation, process according to congestion packet loss, to guarantee the reliability of whole method.
Claims (10)
1. a differentiation type jamming control method for packet loss perception, is characterized in that:
Utilize Link State that link layer detects to distinguish congested, error code and link disconnects, congested, error code and link are disconnected respectively by dissimilar signaling source, make source renewal local state information;
To different packet loss types, adopt differentiation type congestion control mechanism, when None-identified packet loss reason, adopt default default process pattern.
2. the differentiation type jamming control method of packet loss perception as claimed in claim 1, is characterized in that: to different packet loss types, sending node will adopt corresponding response mode;
For congestion packet loss, adopt the VJ mechanism of TCP standard to process, transmission rate is reduced by half, and re-transmission clock is doubled;
For packet lost by corruption, do not change transmission rate, retransmission time out value also remains unchanged, and congestion control mechanism is converted to Vegas mechanism simultaneously;
In the time there is the phenomenon of disconnection in link, will stop sending any new data, stop retransmitting clock, periodically whether detecting link recovers simultaneously, when source is received an indication, while showing that opposite end has recovered to connect, will recover to run well.
3. the differentiation type jamming control method of packet loss perception as claimed in claim 1, is characterized in that: the available information that obtains link from link-local interface by data link layer signaling;
The state information of maintenance link availability, in the time that Link State changes, to sending change information from the nearest upstream neighbor node of this link;
Data source is known this change information.
4. the differentiation type jamming control method of packet loss perception as claimed in claim 1, is characterized in that: the message queue size by monitoring node place changes and regularly sends that probe messages is distinguished congested, error code and link disconnects;
In the time there is message dropping, if when message queue size exceedes threshold value p, be judged as congested;
If message queue size does not reach threshold value p, be judged as error code;
If while there is packet loss, the probe messages regularly sending is not received response in time-out time, is judged as link and disconnects.
5. the differentiation type jamming control method of packet loss perception as claimed in claim 1, is characterized in that: packet loss reason determining step is described below:
Step 1: find that there is message dropping phenomenon, check that whether probe messages is overtime, if overtime, go to step three; If do not have overtimely, go to step two;
Step 2: the queue length in node buffering area is less than p, show that packet loss is former because link error code; If queue length is greater than p, packet loss is former because link congestion;
Step 3: providing packet loss reason is that link disconnects.
6. the differentiation type jamming control method of packet loss perception as claimed in claim 1, transmit leg it is characterized in that: when cannot judge packet loss type, transmit leg will adopt default congestion processing method, be that congestion control mechanism is set to VJ mechanism, transmission rate is reduced by half simultaneously, retransmission time out value doubles, and namely in default situation, processes according to congestion packet loss.
7. the differentiation type jamming control method of packet loss perception as claimed in claim 1, is characterized in that: according to packet loss cause information, send corresponding notice message to contiguous upstream node.
8. the differentiation type jamming control method of packet loss perception as claimed in claim 7, it is characterized in that: notice message is for send the information of message dropping reason to adjacent upstream node, so that sending node is taked corresponding congestion control policy according to different packet loss reasons.
9. the differentiation type jamming control method of the packet loss perception as described in claim 1-8 any one, is characterized in that: the step that sends corresponding notice message according to different packet loss reasons is described below:
Step 1: judge the link disconnection if of packet loss reason, send link and disconnect notice to adjacent upstream node;
Step 2: judge packet loss reason link congestion if, send link congestion and notify to adjacent upstream node;
Step 3: judge packet loss reason link error code if, send link error code and notify to adjacent upstream node.
10. the differentiation type jamming control method of the packet loss perception as described in claim 1-8 any one, is characterized in that: the step of differentiation type congestion control mechanism is described below:
Step 1: if packet loss type is congestion packet loss, transmission rate is reduced by half, retransmission time out value doubles, it is VJ mechanism that congestion control mechanism is set, and forwards step 5 to;
Step 2: if packet loss type is packet lost by corruption, transmission rate is constant, retransmission time out value is constant, and congestion control mechanism is set to Vegas mechanism, forwards step 5 to;
Step 3: disconnect if packet loss type is link, stop sending data, stop retransmitting clock, and go to step four;
Step 4: periodically send probe messages, check whether link recovers, if recovered, continue to send message, if do not recovered, constantly survey;
Step 5: finish.
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| CN104093169A (en) * | 2014-06-10 | 2014-10-08 | 北京邮电大学 | MAC-TCP cross-layer optimization congestion control method and system |
| CN104092707A (en) * | 2014-07-31 | 2014-10-08 | 中国电子科技集团公司第五十四研究所 | Block verification and acknowledgement-based satellite network TCP (Transmission Control Protocol) performance enhancement method |
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| CN104639568A (en) * | 2015-03-12 | 2015-05-20 | 成都金本华科技股份有限公司 | Data transmission method based on UDP (user datagram protocol) |
| CN108476430A (en) * | 2016-01-20 | 2018-08-31 | 三星电子株式会社 | Device and method for controlling transmission on high throughput wireless network |
| CN105791008A (en) * | 2016-03-02 | 2016-07-20 | 华为技术有限公司 | Method and device for determining packet loss location and reason |
| CN105791008B (en) * | 2016-03-02 | 2019-10-22 | 华为技术有限公司 | The method and apparatus for determining packet loss position and reason |
| CN105827544A (en) * | 2016-03-14 | 2016-08-03 | 烽火通信科技股份有限公司 | Congestion control method and apparatus for multi-level CLOS system |
| WO2019037405A1 (en) * | 2017-08-25 | 2019-02-28 | 深圳市华讯方舟空间信息产业科技有限公司 | Tcp-based packet loss processing method, and computer readable storage medium |
| CN109150589A (en) * | 2018-07-25 | 2019-01-04 | 赛尔网络有限公司 | Based on the processing method and system that Open Stack virtual network obstruction is abnormal |
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Application publication date: 20140528 |