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An improved power saving mechanism for MAC protocol in ad hoc networks

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4 Author(s)
Takeuchi, S. ; Grad. Sch. of Sci. & Eng., Waseda Univ., Tokyo, Japan ; Yamazaki, K. ; Sezaki, K. ; Yasuda, Y.

Ad hoc networks have recently become a hot topic. In ad hoc networks, battery power is an important resource, since most terminals are battery powered. Terminals consume extra energy when their network interfaces are in the idle state or when they overhear packets not destined for them. They should, therefore, switch off their radio when they do not have to send or receive packets. IEEE802.11 features a power saving mechanism (PSM) in the distributed coordination function (DCF). In PSM for DCF, nodes must stay awake for a fixed time, called the ATIM window (ad-hoc traffic indication map window). If nodes do not have data to send or receive, they enter the doze state except for during the ATIM window. However, ad hoc networks with PSM have larger end-to-end delays to deliver packets and suffer lower throughput than the standard IEEE802.11. To solve this problem, this paper proposes a protocol that reduces delay and achieves high throughput and energy efficiency. Simulation results show that our proposal outperforms other PSMs in terms of throughput, end-to-end delay and energy efficiency.

Published in:

Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE  (Volume:5 )

Date of Conference:

29 Nov.-3 Dec. 2004

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