Analysis and performance assessment of a fragment retransmission scheme for energy efficient IEEE 802.11 WLANs.
Backoff-free fragment retransmission (BFFR) scheme enhances the performance of legacy MAC layer fragmentation by eliminating contention overhead. The eliminated overhead is the result of backoff executed before a retransmission attempt is made when fragment transmission failure occurs within a fragment burst. This paper provides a mathematical analysis of BFFR energy efficiency and further assesses, by means of simulations, the energy efficiency, throughput and delay obtained when BFFR is used. The validity of the new scheme is evaluated in different scenarios namely, constant bit rate traffic, realistic bursty internet traffic, node mobility, rigid and elastic flows and their combinations at different traffic loads. We also evaluate and discuss the impact of BFFR on MAC fairness when the number of nodes is varied from 4 to 10. It is shown that BFFR has advantages over legacy MAC fragmentation scheme in all the scenarios.
Department of Electronics and Telecommunication Engineering, College of Information and Communication Technologies, University of Dar es Salaam, Dar es Salaam, Tanzania.
Prosper
P
Mafole
Big Data Science and Technology, Division of Environmental Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, Japan.
Masayoshi
M
Aritsugi
CSMA; Energy efficiency; IEEE 802.11 fragmentation; Mathematical analysis; Simulation