A contention based routing enhanced MAC protocol for transmission delay reduction in a multi-hop WSN

In most of wireless sensor network (WSN) applications, energy-efficiency and low end-to-end transmission delay (E2ETD) are essential requirements. This paper presents a contention based routing enhanced MAC protocol, named as CR-MAC, for E2ETD reduction in a multi-hop WSN. CR-MAC reduces E2ETD by optimizing the time interval between the successively sent data packets of a node in a scheduled flow and using a small size control packet to send the request for data transmission. Reduction in the size of control packet also reduces the energy-consumption in the overhearing. We compare the performance of CR-MAC with [4] through ns-2.35 simulations. Results show that CR-MAC outperforms [4] in terms of average energy consumption, E2ETD, and packet delivery ratio.