Delft University of Technology Parallel and Distributed Systems Report Series The λ MAC framework: redefining MAC protocols Tom Parker and Koen Langendoen {T.E.V.Parker,K.G.Langendoen}@tudelft.nl Maarten Bezemer M.C.Bezemer@ewi.tudelft.nl report number PDS-2007-004 PDS ISSN 1387-2109