An improved low-delay MAC protocol for WSNs
Zhou Jin · Journal of Zhengzhou University of Light Industry · 2014
Aiming at the problem that IEEE 802. 15. 4 MAC protocols in wireless sensor networks had high delivery latency,an improved low-delay MAC mechanism LD-MAC based on the existing LE-MAC protocol was proposed. The protocol reduced the delivery latency by improving the number of CCA. When the backoff counter reached zero,the node performed carrier sensing that consisted of clear channel assessment( CCA) for the next CW consecutive backoff slots. If the channel was sensed idle during the first CCA,the node tansmitd the data directly. The properties of the improved mechanism were analyzed theoretically by using two-dimensional Markov chain model. The simulation results showed that LD-MAC not only reduced the delivery latency but also improved the throughput significantly by only increasing energy consumption slightly.