Abstract:

In order to reduce the energy consumption of a 6LoWPAN node, a channel contention access mechanism based on enabled node sleep state is proposed. In the mechanism, nodes can appropriately sleep during both the superframe backoff period time and the superframe dormant period. Then a Markov chain model is established for the mechanism, and the corresponding mathematical derivation is carried out. Based on this model, the mathematical analysis on the average energy consumption, the steadystate probability of sending packets and the packet service time is performed, and moreover the influence of the protocol parameters NB and minBE on the network performance is also analyzed. The mathematical analysis shows that the model describes the channel contention access mechanism of 6LoWPAN very well, and the mechanism effectively reduces the average consumption and greatly improves the protocol performance.

Key words: 6LoWPAN;channel access;sleep;energy consumption