A Medium Access Control Mechanism for Digital-Energy Integrated Wireless Sensor Networks

Abstract

The invention discloses a media access control (Media Access Control, MAC) mechanism for digital-energy integrated wireless sensor networks, which is applied to the field of wireless sensor networks and addresses the problems existing in the prior art; the invention introduces wireless digital-energy simultaneous interpretation technology , change the superframe structure of the traditional IEEE 802.15.4 protocol, optimize the GTS time slot allocation scheme of the wireless access point, and take the residual energy of the terminal node, the numerical difference between the two collected data before and after, and the validity period of the newly collected data as the judgment conditions. To guide the allocation of GTS time slots, the support vector machine algorithm of machine learning is introduced, and a learner model of support vector machine is obtained by supervised learning based on historical data, and the decision boundary value of the learner model is used as the benchmark for GTS time slot application. value, and the GTS slot application scheme is determined by comparing with the reference value.

Description

technical field [0001] The invention belongs to the field of wireless sensor networks, in particular to a MAC layer mechanism of the wireless sensor network. Background technique [0002] Wireless Sensor Network (WSN) is a wireless distributed sensor network, in which sensor nodes (Sensor Node, SN) can sense and check the external world environment, collect environmental parameters, and periodically report to wireless access points (Access Points). Point, AP) transmits the collected data, which is convenient for the wireless access point to monitor and count the environmental status of the entire external world. The sensor nodes and the wireless access points are communicated and interconnected wirelessly, and the IEEE 802.15.4 protocol is generally used to realize wireless communication, forming a multi-hop self-organizing network. With the rapid development of modern technology, wireless terminal sensor nodes generally require flexible locations and mobility, so most of t...

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Problems solved by technology

[0006] 1. The power supply mode of the passive terminal sensor node is inconvenient, which conflicts with the mobile characteristics of its location;

[0007] 2. When the traditional IEEE 802.15.4 protocol is used for wireless communication, most of the time slots in a superframe period are arranged for uplink data transmission, and only one time slot is arranged for downlink transmission of beacon frames, resulting in The energy consumption of passive terminal sensor nodes is very large;

[0008] 3. In a network using the traditional IEEE 802.15.4 protocol, the wireless access point's allocation scheme for GTS time slots follows the first-come-first-served principle by default, and does not take into account the energy status and data urgency of the GTS time slot application nodes (i.e. the value change of the previous two collections and the life validity period of the new collection value), so that the guaranteed GTS time slot has not been optimally utilized;

[0009] 4. In a network using the traditional IEEE 802.15.4 protocol, if the terminal node has data to send and wants to communicate through GTS time slots, it will definitely apply for GTS time slots by default; GTS time slot applications need to consume additional However, when the terminal node applies for the GTS time slot, it does not consider whether the GTS time slot application has the possibility of success, which makes a lot of energy wasted in the process of meaningless GTS time slot application. low utilization

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