Lecture 24: Wireless Networks

The Hidden Terminal Problem

The mobility provided by wireless networks has made a huge difference in the lives of most citizens of the internet. However, several challenges have to be overcome by a wireless link layer to make that promise into a reality. Primary among them is the lack of collision detection due to receiver shutdown during transmission. The hidden terminal problem also means that collisions are not apparent to all hosts on a link. This lecture will examine the collision avoidance mechanisms that are key to 802.11 wireless protocols.

Lesson Objectives

By the end of this lesson, the student will be able to: