Pure Contention-Based MAC Layer Protocols to avoid The Hidden Node Problem – A Review

Abstract

One of the problems in Cognitive radio is the hidden node problem which as a result of sightless collisions leads to packet loss, degrading the QOS of the network, delays in transfers and many more problems. In this paper we discuss the advancements made in contention-based protocols to avoid the hidden node problem. We arrange them in three classes, which are Sender-initiated, Receiver-initiated and Hybrid protocols. In the end, we discuss the challenges associated with hidden node problem.