Research And Implementation Of Resource Allocation Mechanism In Energy Harvesting Wireless Body Area Network

Wireless Body Area Network(WBAN)is a small human-centered communication network composed of multiple wireless wearable or embeddable sensor devices.Its sensor nodes have the characteristics of low power,miniaturization and limited energy.In recent years,with the rapid development of sensor technology and wireless communication technology,wireless body area network has been widely used in many fields such as medical treatment,sports and military.Among them,wireless body area network applications in the medical field have attracted the most attention due to broad market prospects and huge internal demands.The wireless body area network can monitor the user's sign data in real time,and upload it to the remote medical service platform through the sink node,thereby providing users with many services such as health detection and remote diagnosis and treatment.Wireless body area network technology can effectively improve medical efficiency,save social resources,and reduce the cost of medical treatment for patients,which is of great social significance.In the field of wireless body area network research,the energy problem has always been a research topic that has received much attention.Due to the limited energy storage capacity of miniaturized body area network nodes,it is often difficult for body area network systems to obtain sufficient energy supply to maintain continuous and stable services.Energy-harvesting wireless body area network is an emerging solution to the problem of energy limitation.From the perspective of technological changes,compared with the mainstream energy-saving solutions in the past,the energy harvesting solution has fundamentally changed the main idea of the energy solution of the body area network.While bringing new breakthroughs and opportunities,it also derived some new difficulties.The resource allocation mechanism is an important optimization goal in the current body area network field.It mainly focuses on the strategy of cooperative work among the body area network nodes.performance of various indicators.However,with the emergence of energy-harvesting body area networks,more factors such as energy transmission and radio frequency power control need to be comprehensively considered,and finding a suitable resource allocation scheme also faces more difficulties.Therefore,this paper aims to enable the wireless body area network to provide users with more stable and reliable services,and conduct research on energy supplementation,power adjustment,and time slot allocation in the resource allocation mechanism.The main content and innovative work of the paper can be summarized as the following three points:(1)A hybrid energy supplementation scheme based on kinetic energy harvesting technology and radio frequency energy transmission technology is proposed,which is more robust than existing energy supplementation schemes.Piezoelectric micro-cantilever kinetic energy collection equipment is integrated at the nodes where the human body moves with a large range,so that the collected kinetic energy can be converted as the external energy supplement of the energy-harvesting wireless body area network system.At the same time,considering the energy level difference between nodes during the energy replenishment process,the RF energy output antenna is deployed at the high energy level node that integrates the kinetic energy harvesting module,and the remaining nodes are supplemented by radio frequency energy harvesting technology.The rebalance of energy levels between different times avoids single point failures caused by energy exhaustion,thereby extending the system life cycle.(2)A dynamic adjustment mechanism of RF energy transmission power based on entropy weighting method is proposed,which can further improve the robustness and energy efficiency of the hybrid energy supplementation scheme by periodically sensing the state of the system and adjusting the transmission power.utilization.In the process of system state perception,the RF energy output node periodically evaluates the timing of performing energy transmission tasks through parameters such as node energy level and congestion,and dynamically adjusts the RF energy output power according to the scoring results to adapt to changes in the system environment.At the same time,an algorithm for determining the execution period of the entropy weight method based on the number of changes in the calculation sequence is designed,which further reduces the time complexity of the scheme synthesis by avoiding additional invalid calculations.(3)A MAC layer protocol based on auction game is proposed,which optimizes and improves the time slot allocation mechanism in the existing protocol,and fully considers the new energy collection rate and energy transmission rate in the hybrid energy supplement scheme.The effect of parameters on the results.The MAC layer protocol adopts the ideological theory of auction game,formulates a suitable ideal auction model according to the characteristics of the time slot allocation process of the body area network,and proves the efficiency of the model through the theoretical basis of game theory.Secondly,the node evaluation bidding strategy in the auction model is formulated by combining factors such as the energy level,congestion,channel quality and energy harvesting capability of the body area network nodes,thereby ensuring the objectivity and fairness of resource allocation.Finally,through the comparison experiment with CSMA/CA and 802.15.4in the industry,the performance improvement of the scheme in multiple indicators.