Multi-rate relaying for performance improvement in IEEE 802.11 WLANs

Feeney, Laura Marie and Cetin, Bilge and Hollos, Daniel and Kubisch, Martin and Mengesha, Seble and Karl, Holger (2007) Multi-rate relaying for performance improvement in IEEE 802.11 WLANs. In: 5th International Conference on Wired/Wireless Internet Communications (WWIC 2007), 23-25 May 2007, Coimbra, Portugal.

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It is well known that the presence of nodes using a low data transmit rate has a disproportionate impact on the performance of an IEEE 802.11 WLAN. ORP is an opportunistic relay protocol that allows nodes to increase their effective transmit rate by replacing a low data rate transmission with a two-hop sequence of shorter range, higher data rate transmissions, using an intermediate node as a relay. ORP differs from existing protocols in discovering relays experimentally, by optimistically making frames available for relaying. Relays identify themselves as suitable relays by forwarding these frames. This approach has several advantages compared with previously proposed relay protocols: Most importantly, ORP does not rely on observations of received signal strength to infer the availability of relay nodes and transmit rates. We present analytic and simulation results showing that ORP improves the throughput by up to 40% in a saturated IEEE 802.11b network.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:IEEE 802.11; cooperative communication protocols; rate adaptation; multi-hop wireless networks; wireless LAN
ID Code:2629
Deposited By:Mr Ian Marsh
Deposited On:15 Feb 2008
Last Modified:15 Jul 2016 14:05

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