Idle listening aware energy efficient scheme for the DCF of 802.11n
Date Issued
2008
Date
2008
Author(s)
Lin, Ta-Wei
Abstract
Owe to the success of 802.11, this popular WLAN technology has been embedded in those power sensitive devices such as smart phones and PDA now. However, the power energy efficiency of 802.11 will be very low especially as the number of active stations is large and the data time will be very short while the PHY data rate of next generation WLAN is ultra high. We owe this poor energy efficiency to the fact that it will consume a lot of idle listening energy in the period of DIFS, and the energy consuming in idle listening is no far less than that of receiving real data. In fact, all works in the idle listening period is space checking only. In order to reduce this idle power consumption, we do not need to receive the data from the antenna, clock recovery, amplifier, demodulation, FFT and to decoder. Instead, we can use a very intelligent scheme proposed in this thesis to check space quickly. Amplifier and antenna play a large part in energy consumption, so our proposed system turns on/off the power of these two components so that we can wake up quickly (because of space checking only) from the light sleeping mode defined in later section quickly. According to the results of our analysis and NS-2 simulations, we can reduce the idle listening energy tremendously to 17.1% of legacy DCF if check space time is 1
Subjects
WLAN
802.11a
Low-power
MAC layer
Amplifier
SDGs
Type
thesis
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ntu-97-R95922128-1.pdf
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