Energy-Efficient Delay-Aware Preemptive Variable-Length Time Slot Allocation Scheme for WBASN (eDPVT)

The recent evolution of wireless sensor technology is providing unlimited opportunities to remote monitoring and health care applications using Wireless Body Area Sensor Networks (WBASNs). While using WBASN for patient monitoring, emergency situations can appear anytime that requires immediate action without much delay. This leads to the requirement for a new energy-efficient and delay-aware scheme for WBASNs. eDPVT is fulfilling such requirements by proposing a scheme for the Media Access Control (MAC) layer of WBASN. eDPVT is designed to reduce the packet delivery delay for emergency data, which is being transmitted from heterogeneous biosensor nodes to eDPVT base station node in WBASN. In addition to the delay, this scheme also reduces energy consumption with the introduction of variable-length time slots in the context-free period of the super frame. eDPVT handles emergency situations with least delay with the help of preemption mechanism used in this scheme. For performance evaluation, eDPVT is compared with eMC-MAC protocol. ns3 simulation of eDPVT results show that eDPVT is energy-efficient scheme, and there is a significant reduction in average packet delivery delay.