Medium access control MAC mechanism for digital-energy integrated wireless sensor network

Abstract

The invention discloses a Media Access Control (MAC) mechanism for a digital-energy integrated wireless sensor network, which is applied to the field of wireless sensor networks and aims at solving the problems in the prior art. According to the invention, a wireless data and energy simultaneous transmission technology is introduced; the superframe structure of the traditional IEEE 802.15. 4 protocol is changed; the GTS time slot allocation scheme of the wireless access point is optimized; the residual energy of the terminal node, the numerical value difference between the two acquired data and the life validity period of the newly acquired data are used as judgment conditions to guide the distribution of the GTS time slot; a support vector machine algorithm of machine learning is introduced, supervised learning is carried out according to historical data to obtain a learner model of a support vector machine, a decision boundary value of the learner model serves as a GTS time slot application reference value, and a GTS time slot application scheme is determined by comparing the decision boundary value 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 send wireless access point (Access 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. Each sensor node and wireless access point are interconnected through wireless communication, generally using IEEE 802.15.4 protocol 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 them are passive devices wit...

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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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