Wireless sensor network MAC protocol designing method based on radio frequency energy harvesting

Abstract

The present invention discloses a wireless sensor network MAC protocol designing method based on radio frequency energy harvesting. The method comprises: first, assigning different priorities to energy transmission and data transmission so that the energy transmission priority is higher than the data transmission priority and that the in-time supplementing of energy can be ensured; then assigning higher priorities to the sensor nodes with higher residual energy to transmit data so that the energy consumption of the nodes in the network is relatively uniform; and through the adjustment of the initial phase of an energy emitting station, realizing the obtaining of the maximal energy at energy requesting nodes; and at the same time according to the service load intensity, allocating charging durations for each energy request to prevent communication interruption from lasting too long, achieving the synchronized adaption of energy harvesting and data transmitting.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and in particular relates to an energy collection technology. Background technique [0002] Wireless sensor networks (WSNs) are composed of several sensor nodes with wireless communication energy self-organized. The sensor node transmits the collected data information of the monitoring object to the data collection center (sink node) through wireless communication to complete the monitoring of an area. Since the sensor nodes deployed in WSNs are usually small in size, simple in structure, and only equipped with tiny low-power batteries, the survival time of the sensor nodes is limited, which in turn makes the survival time of the entire network limited. one of the most important issues. [0003] Energy harvesting technology (Energy Harvesting, EH) is a technology that collects energy from external energy sources (eg, solar energy, thermal energy, and electromagnetic energy) and...

AI Technical Summary

Problems solved by technology

However, there are more difficulties in using RF energy harvesting technology in WSNs. There are mainly three problems: 1) energy transmission will cause interference to data transmission, and the two compete for channels; 2) data transmission of nodes depends on The energy supplied by energy transmission; 3) RF signals will interfere when they propagate in space. If the energy transmission of ET is not properly planned, there may be some characteristic locations that cannot receive energy supply

RFID technology is most likely to be used for energy transmission, but there are limitations in directly transplanting it into network scenarios. For this technology, radio frequency energy is usually concentrated in a small part of the space, while WSNs have a wide space to cover

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