Approaches to Multiple Access Fixed Assignment (TDMA, FDMA, CDMA each node is allocated a fixed fraction of bandwidth Equivalent to circuit switching very inefficient for low duty factor traffic Contention systems Polling Reservations and Scheduling Random accessApproaches to Multiple Access • Fixed Assignment (TDMA, FDMA, CDMA) – each node is allocated a fixed f raction of bandwidth – Equivalent to circuit switching – very inefficient for low duty factor traffic • Contention systems – Polling – Res ervations and Scheduling – Random Access Eytan Modiano Slide 4