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An Opportunistic Backoff Scheme for Dense IEEE 802.11 WLANs

Karaca, Mehmet LU ; Zhang, Zhi LU and Landfeldt, Björn LU (2016) IEEE Global Communication Conference (GLOBECOM), 2015 In Proc. of the IEEE GLOBECOM'15 WS Enabling Technologies in Future Wireless Local Area Network (ETFWLALN)
Abstract
In dense deployments, the performance of IEEE 802.11 Wireless Local Area Networks (WLANs) depends on the development of efficient contention resolution mechanisms since the collision probability can be high even with low number of users with the current 802.11 MAC mechanism. Also, the current 802.11 MAC is not opportunistic in the sense that it does not consider channel quality and traffic load of users, which can greatly degrade the network capacity. In this paper, we propose a new backoff scheme which performs well for dense networks resulting in low collision probability. Also, our backoff scheme opportunistically gives higher priority to users with high traffic load and better channel conditions, and thus reduces unnecessary... (More)
In dense deployments, the performance of IEEE 802.11 Wireless Local Area Networks (WLANs) depends on the development of efficient contention resolution mechanisms since the collision probability can be high even with low number of users with the current 802.11 MAC mechanism. Also, the current 802.11 MAC is not opportunistic in the sense that it does not consider channel quality and traffic load of users, which can greatly degrade the network capacity. In this paper, we propose a new backoff scheme which performs well for dense networks resulting in low collision probability. Also, our backoff scheme opportunistically gives higher priority to users with high traffic load and better channel conditions, and thus reduces unnecessary contention. We analytically show that the performance of our backoff algorithm can be pushed to the maximum throughput in exchange for longer backoff delay, which is compensated with reduced number of collisions. We evaluate our algorithm in OMNeT++, and show that compared to the legacy 802.11 Distributed coordination Function (DCF) the aggregated network throughput can be increased up to 70\% by using our algorithm. Also, compared with legacy DCF, the maximum number of supportable users is much higher and the end-to-end delay performance is better with our backoff scheme for dense scenarios under the same traffic conditions. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
IEEE 802.11, dense networks, opportunistic 802.11 DCF
in
Proc. of the IEEE GLOBECOM'15 WS Enabling Technologies in Future Wireless Local Area Network (ETFWLALN)
conference name
IEEE Global Communication Conference (GLOBECOM), 2015
external identifiers
  • Scopus:84971229218
ISBN
9781467395267
language
English
LU publication?
yes
id
541667cf-2587-4007-af71-3306b0f87568 (old id 8053221)
date added to LUP
2015-10-08 15:33:58
date last changed
2016-10-13 04:52:49
@misc{541667cf-2587-4007-af71-3306b0f87568,
  abstract     = {In dense deployments, the performance of IEEE 802.11 Wireless Local Area Networks (WLANs) depends on the development of efficient contention resolution mechanisms since the collision probability can be high even with low number of users with the current 802.11 MAC mechanism. Also, the current 802.11 MAC is not opportunistic in the sense that it does not consider channel quality and traffic load of users, which can greatly degrade the network capacity. In this paper, we propose a new backoff scheme which performs well for dense networks resulting in low collision probability. Also, our backoff scheme opportunistically gives higher priority to users with high traffic load and better channel conditions, and thus reduces unnecessary contention. We analytically show that the performance of our backoff algorithm can be pushed to the maximum throughput in exchange for longer backoff delay, which is compensated with reduced number of collisions. We evaluate our algorithm in OMNeT++, and show that compared to the legacy 802.11 Distributed coordination Function (DCF) the aggregated network throughput can be increased up to 70\% by using our algorithm. Also, compared with legacy DCF, the maximum number of supportable users is much higher and the end-to-end delay performance is better with our backoff scheme for dense scenarios under the same traffic conditions.},
  author       = {Karaca, Mehmet and Zhang, Zhi and Landfeldt, Björn},
  isbn         = {9781467395267},
  keyword      = {IEEE 802.11,dense networks,opportunistic 802.11 DCF},
  language     = {eng},
  series       = {Proc. of the IEEE GLOBECOM'15 WS Enabling Technologies in Future Wireless Local Area Network (ETFWLALN)},
  title        = {An Opportunistic Backoff Scheme for Dense IEEE 802.11 WLANs},
  year         = {2016},
}