Wireless energy supply sensor network time distribution method based on fixed-point iteration

Abstract

The invention discloses a wireless energy supply sensor network time distribution method based on fixed-point iteration, and aims to minimize the energy consumption of a network and prolong service time of an HAP under a condition that a throughput requirement of a sensor is met in ST-WPSNs. According to characteristics of a proposed optimization problem, a fixed-point iteration method is combined; and a low-complexity adaptive dynamic time distribution method is designed. Optimal energy transmission and sensor data transmission time distribution in a transmission period are obtained through calculation before each transmission period starts, and a purpose of minimizing network energy consumption is achieved under a constraint condition of meeting the throughput requirement of the sensor.Compared with an existing method for solving through a traditional convex optimization method, the method has advantages that operation complexity is obviously reduced, a special situation that a feasible set of an original optimization problem is empty is considered, higher robustness is achieved, and the method is more suitable for ST-WPSNs scenes.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor communication, and in particular relates to a time allocation method for a wireless energy supply sensor network based on fixed-point iteration. Background technique [0002] In star topology wireless powered sensor networks (ST-WPSNs, Star Topology Wireless PoweredSensor Networks), considering the scenario where the sensor is not equipped with an energy storage device, the energy supply of the network all comes from the central hybrid access point (HAP, HybridAccess Point). Each sensor node has its own throughput requirements. In order to extend the service time of HAP as much as possible while meeting the throughput requirements of sensor nodes (SN, SensorNode), it is necessary to optimize the transmission time allocation of sensors to minimize the energy of the network. consume. In the traditional equal-interval fixed time allocation method, the time for HAP to transmit energy to senso...

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Problems solved by technology

[0004] Aiming at the defects and improvement needs of the prior art, the present invention provides a wireless power supply sensor network time allocation method based on fixed-point iteration, which minimizes the energy consumption of the network and prolongs the HAP under the condition of meeting the sensor throughput requirements. According to the characteristics of the proposed optimization problem, combined with the fixed-point iteration method, a low-complexity self-adaptive dynamic time allocation scheme is designed

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