Wearable wireless sensors, or Wireless Body Sensor Network (WBSN), is one of the most recent fields of research in healthcare applications. The sensors are placed on the human body to detect the critical medical parameters and transmit the collected data to a centralized node. Though the devices work at low energy and power constraints, maintenance of such devices is a crucial aspect. In light of this requirement, an efficient medium access control (MAC) protocol should be utilized to extend the life time of the network. In this paper, we propose a new “Priority based Energy Efficient (PrEE) MAC protocol” incorporated with various priorities in predefined devices based on data sensing and normal devices changing to priority when the value is more than the threshold, by modifying IEEE 802.15.4 header bits. The PrEE MAC protocol is designed based on the IEEE 802.15.4 and its Superframe structure. The simulation results show that the energy efficiency and lifetime of the proposed MAC protocol is more as compared to the existing MAC protocol.

可穿戴无线传感器或无线人体传感器网络（WBSN）是医疗保健应用领域中最新的研究领域之一。传感器放置在人体上，以检测关键医学参数并将收集到的数据传输到集中式节点。尽管设备在低能量和功率约束下工作，但是此类设备的维护是至关重要的方面。根据这一要求，应利用有效的媒体访问控制（MAC）协议来延长网络的使用寿命。在本文中，我们提出了一种新的“基于优先级的节能（PrEE）MAC协议”，该协议在数据感应的基础上在预定义设备中纳入了各种优先级，并且通过修改IEEE 802.15，当正常设备的值大于阈值时将其更改为优先级。 4个标头位。PrEE MAC协议是基于IEEE 802.15.4及其超帧结构设计的。仿真结果表明，与现有的MAC协议相比，所提出的MAC协议的能量效率和寿命更长。