Dynamic beacon interval (BI) design method based on wireless multimedia sensor networks enhanced distributed channel access (EDCA) mechanism

Abstract

The invention provides a dynamic beacon interval (BI) design method based on a wireless multimedia sensor networks enhanced distributed channel access (EDCA) mechanism. The invention has the advantages that: the method is applied to wireless multimedia sensor networks, the characteristics of different data traffic are completely utilized, corresponding BIs are designed according to different types of data; on one hand, collision between high priority traffic sensitive to time such as audio streams and video streams and low priority traffic, which is generated during channel competition, can be reduced, more chances of accessing channel can be acquired, so that energy waste caused by the collision can be effectively reduced, network power consumption is reduced, meanwhile, data is continuously transmitted by using a transmission opportunity (TXOP) mechanism after entering a channel, so that the network throughput rate is greatly improved, and network time delay is effectively reduced; and on the other hand, the network power consumption can be effectively reduced by increasing the sleep time of transmitting nodes of the low priority traffic such as E-mail which is not sensitive to the time, and user experience cannot be influenced simultaneously; in addition, the data volume of the low priority traffic is small, so that the influence of low priority traffic on the network throughput and time delay is low.

Description

technical field [0001] The invention relates to the technical field of the wireless multimedia sensor network, in particular to a dynamic BI design method provided with an EDCA mechanism operating in the wireless multimedia sensor network. Background technique [0002] As a new derivative network, Wireless Multimedia Sensor Networks (WMSNs) has gradually become an important new technology in modern society. In recent years, many scientists have increased their attention and research on wireless multimedia sensor networks. [0003] With the rapid development of hardware technology and its miniaturization trend, sensor nodes in wireless multimedia sensor networks can be equipped with CMOS cameras, microphones and many other types of sensors. This enables the wireless multimedia sensor network to obtain detailed and accurate information data in various aspects in a more comprehensive and complex monitoring environment. They can acquire various media information of the surroun...

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Problems solved by technology

Therefore, it is possible to make the network delay too large

[0009] 2) Throughput is reduced. When the ATIM window is too large, the time to send data will be very short, which will reduce network throughput. If the ATIM window is too small, the time to recei

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