The goal of this e is to understand the concept of Carrier-Sensing in IEEE 802.11 standard and compare Physical Carrier Sense and Virtual Carrier Sense mechanisms.

Recall that when Physical Carrier Sense is used, a node seeking to transmit first assesses the channel. if the energy detected on the channel is above a certain threshold (caller carrier sense threshold), the channel is deemed busy, and the node must wait. Otherwise, the channel is assumed idle, and the node is free to transmit