Performance Evaluation of Enhanced Relay-Enabled Distributed Coordination Function

Konferenz: European Wireless 2008 - 14th European Wireless Conference
22.06.2008 - 25.06.2008 in Prague, Czech Republic

Tagungsband: European Wireless 2008

Seiten: 5Sprache: EnglischTyp: PDF

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Ahmad, Rizwan; Drieberg, M. (CTME, School of Electrical Engineering, Victoria University, Melbourne, Australia)
Zheng, Fu-Chun (School of Systems Engineering, University of Reading, Reading, UK)
Olafsson, Sverrir (Mobility Research Centre, BT Group, Martlesham Heath, Ipswich, UK)

In this paper we evaluate the performance of our earlier proposed Enhanced relay-enabled Distributed Coordination Function (ErDCF) for wireless ad hoc networks. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduced energy consumption compared to IEEE 802.11 Distributed Coordination Function (DCF). This is a result of: 1) using relay which helps to increase the throughput and lower overall blocking time of nodes due to faster dual-hop transmission, 2) using dynamic preamble (i.e. using short preamble for the relay transmission) which further increases the throughput and lower overall blocking time and also by 3) reducing unnecessary overhearing (by other nodes not involved in transmission). We evaluate the throughput and energy performance of the ErDCF with different rate combinations. ErDCF (11,11) (i.e. R1=R2=11 Mbps) yields a throughput improvement of 92.9% (at the packet length of 1000 bytes) and an energy saving of 72.2% at 50 nodes.