Minimizing spatial and time reservation with Collision-Aware DCF in mobile ad hoc networks

Song, Lubo; Yu, Chansu

doi:10.1016/j.adhoc.2008.02.002

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Cited by 3 publications

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“…The authors have analyzed the throughput with modified Binary Exponential Backoff (BEB) of IEEE 802.11 DCF [21]. In [19], a reservation based collision aware method has been used to improve the performance of the IEEE 802.11. The paper is organized as follows: Section II discusses the working of Distributed coordination function of 802.11 MAC protocol and includes both basic access and RTS/CTS mechanism.…”

Section: Introductionmentioning

confidence: 99%

Delay Analysis of IEEE 802.11 DCF with modified Binary Exponential Backoff

Singh¹,

Lobiyal²

2011

IJWMN

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Section: Introductionmentioning

confidence: 99%

Delay Analysis of IEEE 802.11 DCF with modified Binary Exponential Backoff

Singh¹,

Lobiyal²

2011

IJWMN

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Improving Spatial Reuse with Collision-Aware DCF in Mobile Ad Hoc Networks

Song

2006 International Conference on Parallel Processing (ICPP'06)

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According to the carrier sensing mechanism adopted by Distributed Coordination Function (DCF) in IEEE 802.11 standard, a node defers its communication if it senses the medium busy. However, this deferment might block more concurrent communications than necessary. In addition, in DCF, the time duration of deferment is not delivered to all potential interferers, particularly those in the distance. This paper proposes Collision-Aware DCF (CAD) that efficiently utilizes the available channel resource along both the spatial and time dimensions. Basically, CAD embeds the spatial and time reservation requirements in the PHY header, which is transmitted at the lower data rate, so that a larger group of potential interferers become aware of the ongoing communication and thus avoid collisions. Extensive simulation based on the ns-2 has shown that CAD offers as much as 21% higher packet delivery rate and 91% lower packet delay than DCF with the CBR (constant bit rate) traffic.

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