Optimizing method and system based on throughput rate and packet loss control CWND

Abstract

The invention provides an optimizing method and system based on the throughput rate and a packet loss control CWND. The method includes the following steps of calculating an actual instant throughput rate for data messages receiving ACK, calculating a smooth throughput rate according to the instant throughput rate, judging the changing state of the smooth throughput rate B, correspondingly controlling the increase mode of the CWND, entering a Recovery mode if packet loss happens at any moment, and reducing the CWND in the Recovery mode according to the CWND shrinkage coefficient. By means of the method and system, the purpose of calculating the CWND under the severe environment that time delay changes are large under the wireless communication environment and bandwidths fluctuate is achieved in a concentrated mode, and the best throughput rate is ensured.

Description

technical field [0001] The invention relates to the network congestion prevention technology of the TCP protocol, and more specifically, to an optimization method and system for controlling CWND based on throughput rate and packet loss. Background technique [0002] The calculation of CWND (Congestion Window, congestion window) is the key to the TCP protocol to prevent network congestion and ensure connection throughput. Therefore, it is also the focus of various TCP algorithm optimization and technical improvement. [0003] CWND represents the maximum number of data segments allowed to be sent without receiving an ACK. Obviously, the larger the CWND is set, the faster the data packets will be sent, but the more likely the network will be congested. On the contrary, if CWND is set smaller, or even set to 1, then every time a data packet is sent, it must wait for the corresponding ACK before continuing to send the next data packet. Obviously, the network is less likely to b...

AI Technical Summary

Problems solved by technology

However, in a network environment mixed with packet loss-based algorithms, since the rapid increase in delay always occurs before packet loss, Vegas always shrinks CWND before the packet loss-based algorithm to reduce the sending speed, resulting in poor overall performance. based on packet loss

[0008] The defect of the existing technology is that the CUBIC algorithm has excellent performance under relatively stable network conditions

However, as mentioned earlier, the Vegas algorithm will be at a disadvantage in terms of preempting bandwidth when it is deployed in a mixed manner with the packet loss-based algorithm.

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