Data queue length-based channel access method for wireless sensor network

Abstract

The invention discloses a data queue length-based channel access method for a wireless sensor network. The method comprises the following steps that: a node periodically performs awakening and sleep scheduling to reduce energy consumption, measures own data queue length in real time after the awakening of each time, judges a current congestion degree, and stagewise regulates the size of a competition window according to different levels of the queue length to improve the priority of a competition channel of a congested node and relieve congestion; if the data queue length is less than 1 / 3 of queue capacity, the node adopts a slow competition window regulation mechanism to slowly reduce the size of the competition window of the node along with the increase of the queue length to avoid early congestion; and when the data queue length is more than 1 / 3 of the queue capacity, the node adopts a radical competition window regulation mechanism to quickly reduce the size of the competition window of the node along with the increase of the queue length to eliminate the congestion as soon as possible. By the method, data packets can be uniformly distributed on nodes in the network in a network transmission process, so that the congestion is effectively relieved and eliminated, and the problem of network deterioration caused by the congestion is solved.

Description

technical field [0001] The invention relates to the field of wireless networks, in particular to the field of wireless sensor network design, and specifically provides a channel access method based on the length of a data queue in the wireless sensor network. Background technique [0002] At present, the channel access method in the wireless sensor network application system is one of the most important technologies, and it is a key factor affecting the overall performance of the network. When multiple nodes perform data communication, a more effective method is needed to coordinate the channel access of nodes. In order to achieve higher network communication performance and lower energy consumption. Due to the current wireless sensor network applications usually have relatively high power consumption requirements, nodes generally adopt periodic listening and sleep scheduling mechanisms in channel access technology, that is, nodes periodically enter the sleep state to reduce...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual wireless sensor network application, there are often many difficult problems to be solved: 1) Data is usually transmitted from the source node to the sink node through aggregation, and data packets are easy to accumulate in the intermediate nodes and cause congestion, which seriously reduces the Network performance; 2) Nodes use periodic listening to sleep scheduling, which actually causes many data packets to fail to be sent out during this period, thereby further aggravating the accumulation of data packets and aggravating congestion; 3) The existing wireless sensor network channel connection In the entry method, there is a lack of effective means to allow congested nodes to have a higher priority to quickly send the accumulated data to eliminate congestion

These existing problems have seriously affected the wide application of wireless sensor networks in various industries.

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