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+# Framework for channel access policies in IoT network
+This tutorial demonstrate the use of the updated EPHYL framework.
+IoT transmissions suffer from extensive collisions when an ALOHA-style transmission policy is used. The study of new decentralized channel access policies is promising to reduce energy consumption, latency and errors due to retransmission induced by such collisions.
+In this tutorial we use a modular and open-source slotted framework for multi-user access protocols developed in a GNU radio environment. Each node transmission to the base station is made in a shared slotted time-frame where a decentralized access policy determines which slot to use. Then, a modular and replaceable physical (PHY) layer is used to create the transmitted signal.