pure aloha

pure

ALOHA and Slotted ALOHA Experiment Objective: To simulate the ALOHA and Slotted ALOHA protocols in MATLAB and observe the effect of network load, throughput, and collision rates for both protocols. ALOHA: 1. Each node transmits its data randomly (without any time synchronization). 2. If two nodes collide (i.e., they transmit at the same time), both nodes back off for a random time and then try again. Start Initialize Simulation Parameters Generate Random Time for Packet Arrival if the Channel is Idle Transmit Packet Wait for Random Time and Retry Check for Packet Collision Wait for Random Time and Retry Successfully Transmit Packet Yes No Yes No Flow chart of ALOHA Slotted ALOHA: 1. Time is divided into discrete slots. Each node is synchronized and can only transmit at the start of each time slot. 2. If two nodes attempt to transmit during the same time slot, a collision occurs, and both nodes back off and retry at a random time. Start Initialize Simulation Parameters Define Time Slot Length Generate Packet Arrival Time in Slot Check if the Slot is Idle Transmit Packet at the Beginning of the Slot Wait for Next Slot and Retry Check for Packet Collision Successfully Transmit Packet Wait for Next Slot and Retry No Collision Collision Yes No Flow chart of Slotted-ALOHA Network Parameters numNodes Number of nodes in the simulation numSlots Total number of slots (time units) for transmission numTrials Number of trials to simulate in order to average results transmissionProb Probability that a node will transmit in a given time slot (used to simulate traffic load). Simulation Loop: 1. Each trial generates a matrix of random transmissions for all nodes at each time slot. 2. ALOHA and Slotted ALOHA protocols are simulated by calling respective functions (runAloha and runSlottedAloha). Results: 1. Throughput: Percentage of successful transmissions over total slots. 2. Collision Rate: Percentage of time slots where a collision occurred. 3. The results are visualized using bar charts to compare the average throughput and collision rate for both protocols. Hints:  Throughput for ALOHA will be lower than Slotted ALOHA due to the lack of time synchronization, resulting in higher collision rates.  Slotted ALOHA should show higher throughput as nodes only transmit at the start of a time slot, minimizing collisions. In Lab Manual:  MATLAB Code: Submit the complete code for the experiment.  Graphs: Include bar charts showing throughput and collision rate for both ALOHA and Slotted ALOHA.  Analysis Report: Explain the results, compare the performance of both protocols, and discuss the advantages of Slotted ALOHA over ALOHA.