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

Authors:
Bastian Bloessl
Dr.-Ing. Andre Puschmann
Dr.-Ing. Christoph Sommer
PD Dr.-Ing. habil. Falko Dressler
Typ:
Journal
Status:
accepted
Date of publication
01/01/2015
Abstract:
We present a solution for enabling standard compliant channel access for a fully software-based Software Defined Radio (SDR) architecture. With the availability of a GNURadio implementation of an Orthogonal Frequency Division Multiplexing (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 modifications 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 modifications of the FPGA. We envision the use of our system for example in the vehicular networking domain, where broadcast is the main communication 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
External link
http://dl.acm.org/citation.cfm?id=2721913