Wireless multi-hop network congestion control method and system based on RTT

Abstract

The invention relates to the technical field of wireless networks, and discloses a wireless multi-hop network congestion control method and system based on the RTT. The wireless multi-hop network congestion control method comprises the steps that a notification option containing a timestamp is carried by the last TCP message of sending data; a response ACK message corresponding to the notification option is received; the RTT value of TCP communication at the time is calculated according to the reception condition of the response ACK message, and a theoretical package sending rate is calculated according to the RTT value; the theoretical package sending rate and the current actual package sending rate are compared, the network congestion condition is judged accordingly, and the current actual package sending rate is adjusted correspondingly. The package loss type of a wireless network is accurately learnt through an explicit congestion notification mechanism, the congestion level of the network is predicted according to the package sending rate, congestion control and congestion avoidance are conducted dynamically, the handling capacity of a TCP in a wireless multi-hop environment is improved effectively, and the overall performance of the wireless network is further improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an RTT (Round-Trip Time, round-trip time delay)-based wireless multi-hop network congestion control method and system. Background technique [0002] The TCP protocol is currently a transmission control protocol widely used in the Internet, but the TCP protocol is a sliding protocol designed for wired networks, and is suitable for wired links with low error rates and low packet loss rates. In a wireless network, due to the high bit error rate of the wireless network, the TCP protocol will mistakenly believe that the network is congested and start unnecessary congestion control and avoidance mechanisms, reducing the throughput of the network. At the same time, in the wireless multi-hop network environment, due to the continuous movement of hosts, environmental changes and rapid bandwidth changes, the sender cannot grasp the bottleneck bandwidth of the system ...

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Problems solved by technology

[0004] At the same time, the existing technology still has the following defects: (1) due to the existence of network delay and the continuous change of wireless multi-hop network bandwidth, etc., congestion control cannot accurately reflect the current state of the network; (2) the existing technology The calculation method is complex, and the computing power of wireless multi-hop network nodes is limited, so it is difficult to withstand frequent and large-scale calculations

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