CBH-MAC: Contention-Based Hybrid MAC Protocol for WSNs

Abstract

It is challenging to design a hybrid MAC scheme for delay aware data traffic in WSNs. The Contention-Based Hybrid MAC (CBH-MAC) protocol is proposed where each sensor node operates the reservation procedure used in cross and chain topology, resulting in energy efficiency, maximizing the packet delivery ratio, minimizing contention around the nodes, and reducing end-to-end delay. The neighboring sensor nodes of the receiver and sender receive their individual reservation control packets. The sender transmits data and receives acknowledgment packets during the adaptive contention-free period. As the reservation packets pass through the sensor along the routing path, the sensor nodes reserve the time slots consecutively in multi-hop. The scheme has significant improvement in the end-to-end latency, packet delivery ratio, and energy efficiency