Method for controlling transmission of sink nodes in wireless sensor network

Abstract

The invention provides a method for controlling the transmission of sink nodes in a wireless sensor network. The method comprises the following steps: firstly, averaging the confirmed time intervals of ack packets, then, measuring the available bandwidth and further filtering the acquired available bandwidth with a filter to eliminate errors, thereby acquiring the more accurate value of the available bandwidth; dividing the congestion avoidance stage into two linear-growth stages by measuring the buffer length of the bottleneck link and combining the estimated value of the available bandwidth, particularly, increasing the sending rate of data packets towards the maximal network capacity rapidly and then reducing the rate of reaching the maximal network capacity, so that the sending process can remain stable at a higher sending rate for a long time; and distinguishing congestion packet loss from wireless error code packet loss by the buffer length of the bottleneck link when the packet loss occurs, and rapidly restoring the sending window to the normal size in the wireless sensor network environment with a higher bit error rate, so that the ssthresh (slow start threshold) and the sending window can be adjusted to a proper value according to the network status, and the stability and the throughput rate of the transmission can be effectively improved.

Description

technical field [0001] The present invention relates to the field of wireless networks, in particular to the field of wireless sensor network protocol design, and specifically provides a transmission control method for a convergence node in a wireless sensor network, although the given features can be applied to other network designs. Background technique [0002] The system structure of wireless sensor network is as follows: figure 1 As shown, it usually includes a sensor node (SensorNode), a sink node (Sink Node) and a management node (Manager Node). A large number of sensor nodes are arranged in the monitoring area, and the nodes form a network through self-organization. The information collected by the sensor node itself is preliminarily processed locally, and then sent to the sink node in a multi-hop manner. The aggregation node is also called a gateway, which can aggregate the report data of nearby sensor nodes, pick out some erroneous or abnormal data, perform data ...

AI Technical Summary

Problems solved by technology

However, the wireless network environment where the aggregation node is located has the characteristics of high bit error rate (Bit Error Rate, BER), link bandwidth asymmetry, and large bandwidth-delay product, which makes the traditional transmission control algorithm directly applied to wireless sensors. Poor performance when the network aggregates nodes

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