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Veröffentlichung

Timings Matter: Standard Compliant IEEE 802.11 Channel Access for a Fully Software-based SDR Architecture

Autoren:
Bastian Bloessl
Dr.-Ing. Andre Puschmann
Dr.-Ing. Christoph Sommer
PD Dr.-Ing. habil. Falko Dressler
Typ:
Workshop
Status:
akzeptiert
Veröffentlichungsdatum
07.09.2014
Abstract:
We present a solution for enabling standard compliant chan-
nel access for a fully software-based Software De ned Radio
(SDR) architecture. With the availability of a GNU Radio
implementation of an Orthogonal Frequency Division Multi-
plexing (OFDM) transceiver, there is substantial demand for
standard compliant channel access. It has been shown that
implementation of CSMA on a host PC is infeasible due to
system-inherent delays. The common approach is to fully
implement the protocol stack on the FPGA, which makes
further updates or modi cations to the protocols a complex
and time consuming task. We take another approach and
investigate the feasibility of a fully software-based solution
and show that standard compliant broadcast transmissions
are possible with marginal modi cations of the FPGA. We
envision the use of our system for example in the vehicular
networking domain, where broadcast is the main communi-
cation paradigm. We show that our SDR solution exactly
complies with the IEEE 802.11 Distributed Coordination
Function (DCF) as well as Enhanced Distributed Channel
Access (EDCA) timings. We were even able to identify
shortcomings of commercial systems and prototypes.
Bibtex