A method and device for adjusting out-of-sequence 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, slow convergence speed, increased network resource consumption, etc., and achieve the effect of reducing the number of data packets, realizing effective adjustment, and realizing out-of-sequence duration
Active Publication Date: 2022-05-20
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 objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0057] The embodiment of the present invention provides a method for adjusting the 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 sender of a data packet. like figure 1 As shown, the sender can establish a TCP connection with the receiver, and send data packets to the receiver through the TCP connection. When the receiving end receives the data packet, it may send an ACK message or a SACK message to the transmitting end according to the receiving condition 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 network equipment may ...
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The invention discloses a method and device for adjusting out-of-sequence duration based on a SACK mode, and relates to the technical field of data transmission. The method includes: when receiving a target ACK / SACK message of a target TCP connection, judging the target ACK / SACK Whether the target data packet corresponding to the message belongs to an out-of-order data packet set; if the target data packet does not belong to the out-of-order data packet set, then add a random If the target data packet belongs to the set of out-of-order data packets, adjust 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. Adopting the present invention can not only effectively save network resources, but also realize effective adjustment of out-of-sequence duration of TCP connections in SACK mode.
Description
technical field [0001] The present invention relates to the technical field of data transmission, and in particular, to a method and apparatus for adjusting out-of-order duration based on a SACK mode. Background technique [0002] After the sender sends the data packets to the receiver in sequence through a TCP (Transmission Control Protocol) connection, the receiver can send an acknowledgement message to the sender according to the reception of each data packet. Specifically, when the receiving end receives the data packets in sequence, it can send an ACK (Acknowledgement) message corresponding to the data packets to the transmitting end; when the receiving end does not receive the data packets in sequence, that is, when the out-of-order data packets are received , a SACK (Selective ACK) message corresponding to the data packet can be sent to the sender. [0003] Further, the sender can set a corresponding timeout duration for each TCP connection, and the timeout duration ...
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IPC IPC(8): H04L1/18H04W28/06
CPCH04L1/1854H04W28/06
Inventor 杨鹏程陈士广
Owner CHINANETCENT TECH