Title :
Adaptive ARQ with energy efficient backoff on Markov fading links
Author :
Chockalingam, A. ; Zorzi, Michele
Author_Institution :
Dept. of ECE, Indian Inst. of Sci., Bangalore
fDate :
5/1/2008 12:00:00 AM
Abstract :
In this letter, we are concerned with adaptive ARQ techniques combined with backoff strategies that exploit the bursty nature of wireless links for improved energy savings. Specifically, we propose an adaptive Go-back-N/Stop-and-Wait (GBN/SAW) protocol with backoff and present a renewal reward analysis of the throughput and energy efficiency performance of the proposed scheme. We show that the GBN protocol with a linear backoff (LBO) strategy results in energy savings of about 2 dB compared to GBN with no backoff (NBO) on highly correlated fading channels when the round-trip delays (RTD) are small, and this energy saving decreases as RTD increases. With adaptive GBN/SAW protocol with LBO, however, the energy saving is retained high even for large RTDs. In fact, the proposed adaptive GBN/SAW protocol with LBO performs quite close to that of an ideal (though not practical) backoff scheme which assumes a priori knowledge of the channel status in each slot.
Keywords :
Markov processes; automatic repeat request; fading channels; protocols; radio links; Markov fading link; adaptive ARQ technique; adaptive Go-back-N/Stop-and-Wait protocol; energy efficient linear backoff; fading channel; round-trip delay; wireless link; Automatic repeat request; Delay; Energy efficiency; Fading; Niobium compounds; Performance analysis; Protocols; Strontium; Surface acoustic waves; Throughput;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2008.05991