A new Distributed Coordination Function Adapted to MC-CDMA based W-LANs

Konferenz: European Wireless 2005 - 11th European Wireless Conference 2005 - Next Generation wireless and Mobile Communications and Services
10.04.2006 - 13.04.2005 in Nicosia, Cyprus

Tagungsband: European Wireless 2005

Seiten: 6Sprache: EnglischTyp: PDF

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Orfanos, Georgios; Butsch, Willi (RWTH Aachen University, Chair of Communication Networks, Aachen, Germany)
Habetha, Jörg (Philips Research Laboratories, Aachen, Germany)

IEEE 802.11a/e has become a worldwide wireless local area network (W-LAN) standard, with a rapid development. Many proposals have been made for its further expansion, and some of them focus on multicarrier code division multiple access (MC-CDMA), a novel, high capacity, multicarrier modulation scheme. The use of MC-CDMA in the physical layer, divides the frequency channel from the point of view of medium access control (MAC) layer to many channels separated by different spreading sequences, which we refer to as codechannels (cchs). Previous work [1] has proven the collision avoidance ability of this approach, while achieving higher throughput and low delays. In this paper we present and evaluate a new distributed coordination function (DCF) for the MAC protocol, optimized for the multichannel structure of MC-CDMA networks. Scope of the new DCF is to reduce the backoff times and prioritize some mobile stations (MS) by allowing them to iterate through cchs during backoff. This method leads to a more symmetric distribution of load among the codechannels, which enhances the network performance, as can be seen from the simulation results.