# <center><i class="fa fa-edit"></i>ALOHA Basics: Skewed Workload </center> ###### tags: `Internship` :::info **Goal:** - [x] Learn ALOHA System Model **Resources:** [ALOHA Random Access Protocol (Tutorials Point)](https://www.youtube.com/watch?v=g32GA0YR26U) [Lecture PDF](http://web.mit.edu/6.02/www/currentsemester/handouts/L18_slides.pdf) ::: ### Skewed Workload TDMA only performs well under a uniform workload ![](https://i.imgur.com/ahavTvn.png) **Goal: Work well even under a skewed workload.** ### Nodes Can Independently Decide When to Transmit - Slotted ALOHA requires all nodes to know the number of backlogged nodes - Very difficult to do in practice `p = probability that a node will transmit if it has something to transmit` ### Starved Nodes ![](https://i.imgur.com/PfraKbC.png) ### "Capture Effect" ![](https://i.imgur.com/hG61oix.png) :::warning Use pmin and pmax to Better Performance ::: ![](https://i.imgur.com/5lGz5cY.png)