Method for controlling transmission of sink nodes in wireless sensor network
A wireless sensor and aggregation node technology, applied in wireless sensor network protocol design, wireless network field, can solve problems such as low performance, large bandwidth delay product, link bandwidth asymmetry, etc., to improve throughput, improve stability, The effect of less fluctuation in the send window
Inactive Publication Date: 2009-10-14
SOUTHEAST UNIV
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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.
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