An improved low-delay MAC protocol for WS Ns
ZHOU Jing
Abstract：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 back-off 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.
Keywords：IEEE 802.15.4Markov chain modellow-delayMAC protocol
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 82-87 )