Self-adapted adjustment method for transmission rate of transport layer in wireless self-organized network

Abstract

The invention discloses a transmission level transmitting rate auto-adapted regulation method which is used in the mobile Ad-Hoc network, and belongs to the technical field of communications. The method includes the following steps: firstly, a speed rate control timer is added to realize the decimal value sending window; secondly, in the stage of slow start-up, a send window W is added with 1 whenthe received confirmation numbers exceed a threshold Ns and the send window remains unchanged when the received confirmation number are less than the threshold Ns; thirdly, in the stage of congestioncontrol, the send window W is added with 1 / W when the received confirmation numbers exceed a preset threshold NCA and the send window W remains unchanged when the received confirmation numbers are nomore than the threshold NCA, and the preset value is bigger than the threshold Ns in the step two; lastly, a slow start-up threshold Wth is set to trace the steady network send window. The handling capacity of the Vegas-W method of the invention in the mobile Ad-Hoc network is better than the TCP-Vegas method by 87 percent to maximum and the FeW method by 22 percent to maximum.

Description

technical field [0001] The invention relates to a method in the technical field of communication, in particular to a method for adaptively adjusting transmission layer transmission rate in a wireless ad hoc network. Background technique [0002] Wireless ad hoc networks develop rapidly and are widely used in production and life in the form of WLAN (Wireless Local Area Network) and wireless sensor networks. However, under the limitations of the characteristics of wireless ad hoc networks (such as hidden terminals, exposed terminals, channel errors, topology changes, etc.), the throughput and delay performance of wireless ad hoc networks are far behind wired networks. , still can not meet people's demand for massive data transmission. The end-to-end throughput is limited by the effective channel bandwidth and spatial channel reuse ratio. However, the end-to-end throughput obtained by running the traditional TCP (Transmission Control) protocol used in wired networks on wirele...

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Problems solved by technology

[0003] After searching the prior art documents, it was found that M. Berger et al. published the paper "A Performance Comparison of TCP Protocols over Mobile Ad Hoc Wireless Networks" (Wireless Ad Hoc Performance comparison of the TCP protocol in the network), this paper compares the throughput performance of TCP-Vegas (TCP protocol Vegas version) and TCP-NewReno (TCP protocol Newreno version) in the wireless network, TCP-Vegas is another based on The results show that the throughput of the former is greater than that of the latter, but the performance of TCP-Vegas is worse than that of the FeW algorithm proposed by Kitae Nahm. How to improve its performance in wireless ad hoc networks remains unclear. No relevant reports

In addition, the minimum sending window of TCP-Vegas is greater than or equal to 1, and the sending window is adjusted in integer units, and the sending rate is adjusted every time an ACK is received. The simulation results show that this will cause the wireless ad hoc network to be overloaded, thus increasing conflicts and conflicts. Congestion, causing wrong responses at the routing layer, increasing additional load on the network, and reducing end-to-end throughput

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