Method and device for adjusting out-of-order duration based on SACK mode
A timing and pattern technology, applied in the field of data transmission, can solve the problems of long time consumption, increase of network resource consumption, consumption of network resources, etc., and achieve the effect of reducing the number of data packets, realizing out-of-sequence duration, and saving network resources
Active Publication Date: 2019-09-20
CHINANETCENT TECH
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[0005] On the one hand, when the disorder of data packets in the network is serious, a large number of data packets will be misjudged as packet loss and retransmitted, which will consume a lot of network resources. Further, adjust the disorder according to the magnitude of MIN_RTT / 4 It may take multiple adjustments to make the out-of-order time match the actual out-of-order situation, resulting in slower convergence and longer time-consuming, which will further increase network resource consumption
On the other hand, because some network devices do not support D-SACK mode at present (that is, after a network device repeatedly receives a data packet, it will not feed back a D-SACK message to the sender of the data packet, and cannot feed back D-SACK messages to other network devices. D-SACK message for effective parsing), so there is an urgent need for a method for adjusting the out-of-order duration of TCP connections based on SACK mode that breaks away from D-SACK mode
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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0057] An embodiment of the present invention provides a method for adjusting out-of-sequence duration based on the SACK mode. The method can be implemented by a network device, and the network device can be a sending end of a data packet. Such as figure 1 As shown, the sending end can establish a TCP connection with the receiving end, and send data packets to the receiving end through the TCP connection. When the receiving end receives the data packet, it may send an ACK message or a SACK message to the sending end according to the receiving situation of the data packet. When receiving the ACK / SACK message, the sender can adjust the out-of-order duration of the TCP connection according to the ACK / SACK message. The above-mentioned ne...
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The invention discloses a method and device for adjusting out-of-order duration based on an SACK mode, and relates to the technical field of data transmission. The method comprises the following steps: when a target ACK / SACK message of a target TCP connection is received, judging whether a target data packet corresponding to the target ACK / SACK message belongs to an out-of-order data packet set or not; if the target data packet does not belong to the out-of-order data packet set, adding an out-of-order data packet into the out-of-order data packet set according to the target ACK / SACK message; and if the target data packet belongs to the out-of-order data packet set, adjusting the out-of-order duration of the target TCP connection according to the target RTT of the target data packet and the minimum RTT corresponding to the target data packet. By adopting the method and the device, not only can network resources be effectively saved, but also the disordered duration of the TCP connection in the SACK mode can be effectively adjusted.
Description
technical field [0001] The present invention relates to the technical field of data transmission, in particular to a method and device for adjusting out-of-sequence duration based on a SACK mode. Background technique [0002] After the sending end sends the data packets to the receiving end sequentially through the TCP (Transmission Control Protocol) connection, the receiving end can send a confirmation message to the sending end according to the reception status of each data packet. Specifically, when the receiving end receives the data packets in order, it can send an ACK (Acknowledgment, confirmation) message corresponding to the data packets to the sending end; , a SACK (Selective ACK, Selective Acknowledgment) message corresponding to the data packet may be sent to the sender. [0003] Further, the sender can set a corresponding timeout period for each TCP connection, and the timeout period is the sum of the RTT (Round-Trip Time, round-trip time delay) and the out-of-s...
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IPC IPC(8): H04L1/18H04W28/06
CPCH04L1/1854H04W28/06
Inventor 杨鹏程陈士广
Owner CHINANETCENT TECH