Research On EAP Phase Optimization Mechanism Of IEEE 802.15.6 Protocol

The WBAN is centered on the human body,and is composed of a micro,low-power,lightweight electronic device implanted in the human body,located on the body surface or worn on the body to form a communication network.It collects human physiological data and other information through sensors,or commands actuators to perform corresponding actions,which can provide a new mode of diagnosis,treatment,and care.The wireless body area network will play an important role in future health care.This is of great significance for solving the current problems in health care.IEEE 802.15.6 is a standardized protocol for wireless body area networks.In order to transmit emergency data generated in medical monitoring with high real-time and high reliability requirements,IEEE 802.15.6 specifically sets the Exclusive Access Phase in the superframe structure.However,setting up such an EAP phase comes at a price.On the one hand,the cost of boundary determination and synchronization needs to be paid;on the other hand,the setting of EAP length is also a problem.If the length is insufficient,the capacity is insufficient,and if the length is too long,it will result in waste of resources.In view of the above problems,this article has studied how to optimize EAP transmission.This article finds that in the case of less urgent data traffic,setting up a dedicated EAP stage often results in wasted resources.In order to avoid this problem,this paper designs a method to transmit emergency data through the Random Access Period to replace EAP to ensure high-priority data transmission and improve resource utilization.Simulation experiments confirmed the effectiveness of this method.The main research contents of this article are as follows:(1)A mechanism for transmitting emergency data using the RAP stage is designed.This mechanism uses a new backoff algorithm to improve the CSMA/CA mechanism.It makes it easier for high-priority users to gain access to the channel,thereby coordinating WBAN internal interference and reducing packet collisions.With this mechanism,superframes can be incorporated into the RAP stage without setting EAP separately to improve resource utilization.(2)In this paper,a three-dimensional discrete-time Markov chain analysis model and a Markov sub-chain analysis model for backoff problems are developed.Using these two models,the performance of the CSMA/CA mechanism using the new backoff algorithm was analyzed,and a simulation experiment model based on Castalia was developed,and compared with the original model in terms of packet loss rate,delay,and energy consumption.After experimental comparison,the novel backoff strategy used in this paper can replace the EAP stage to ensure the data transmission of high-priority users.The novel backoff strategy reduces the probability of channel collision in saturated networks,and the number of low-latency data packets increases in saturated networks.