Research On Multi-Point Energy Accumulation Control Strategy Based On Wireless Body Area Network

Wireless Body Area Network(WBAN)is a dynamic heterogeneous network in which multiple sensor nodes capable of collecting human physiological parameters are placed in the human body or on the surface of the human body.It is a special form of Internet of things(Io T).Data transmission is realized by wireless communication between sensor nodes in WBAN,which has been applied in entertainment,medical treatment,military and other fields.With the continuous development of wireless communication technology,the fifth-generation mobile communication technology(5G)has emerged and gradually matured,providing superior communication conditions such as high rate and low delay for WBAN,and greatly promoting the development of WBAN in the medical field.Through implantable sensors and portable sensors,WBAN can ensure residents' healthy and comfortable life through remote health monitoring and diagnosis.It can provide technical support in real-time health monitoring and electronic health and medical services,which is of great significance to the future development of medical system.Since the sensor nodes in WBAN are placed inside the body or on the surface of the human body,the transmission characteristics of the electromagnetic wave emitted by the sensor and the influence of radiation factors on the human body must be considered,which requires the size and weight of the sensor nodes to be miniaturized,while restricting the battery capacity of the sensor nodes.The energy of sensor nodes is an important factor that determines the life cycle of WBAN,and its energy supply is also an urgent problem in WBAN.The emergence of radio frequency(RF)energy collection technology makes the sensor node can receive information and energy signals from the radio frequency signal at the same time,through the receiver can directly collect energy from the radio frequency signal,which can effectively solve the problem of energy collection of sensor nodes,thus avoiding the difficult operation of replacing internal sensors.In addition,when the transmission channel condition of the system is poor,transmission interruption is easy to occur.The method of energy accumulation can make the sensor node continuously collect energy to ensure sufficient energy supply,thus reducing the occurrence of interruption.In WBAN,there are many kinds of physiological parameters that need to be detected,and only one sensor node cannot complete the collection and transmission of various physiological parameter information.However,most current studies are focused on pointto-point information and energy transmission models and protocols containing only one sensor node.The network structure of multi-sensor nodes is complex,so it is necessary to find a reasonable way to distribute the energy collected by sensor nodes in order to ensure the high efficiency of wireless body area network.In addition,how to improve the energy utilization efficiency of sensor nodes in WBAN to achieve efficient and reliable transmission of information is also the focus and difficulty of current research.Aiming at the above-mentioned problems,this paper proposes a research on multi-point energy accumulation control strategy based on WBAN.The main research ideas are: firstly,the half-duplex and full-duplex energy accumulation system models that conform to the channel characteristics of WBAN are designed.Secondly,according to the established system model,two kinds of information and energy transfer protocols are proposed,and the mathematical expression of system throughput is derived.Finally,simulation experiments are carried out under different parameter conditions,respectively.The performance of the two proposed systems was verified.The dominating contribution of this paper is as follows:1.The half-duplex and full-duplex energy accumulation system models based on WBAN are built.Combined with radio frequency energy collection technology,the resource utilization efficiency of the system is improved,at the same time,the life cycle of the system is extended.2.Aiming at the problem of low resource and spectrum utilization efficiency in wireless body area networks,a multi-point half-duplex signal and energy simultaneous transmission control strategy in wireless body area networks is proposed.The sensor nodes work in the half-duplex model and the access point(AP)works in the full-duplex mode,a time division multiple access(TDMA)based information and energy simultaneous transmission protocol is proposed to continuously optimize the system throughput and finally reach the optimal value.3.Aiming at the problem of high efficiency and reliability of information transmission in wireless body area networks,this paper proposes a multi-point full-duplex energy accumulation control strategy in WBAN.The sensor nodes and AP node work in fullduplex mode.Combined with the protocol of firstly collecting energy and then transmitting information,we propose the protocol that can achieve energy accumulation.With the energy and information transmission protocol,the optimal time allocation ratio is obtained through the joint objective linear programming method.Finally,we obtain the maximum throughput of the system.4.The two protocols proposed above are simulated and compared with the traditional sensor nodes and AP node working in the half-duplex mode by using MATLAB,which fully verifies the superiority of the proposed protocol.