Slotted aloha Assumptions: Operation: o all frames same size When node obtains fresh ● time divided into frame, transmits in next equal size slots(time slot to transmit 1 frame) - if no co∥ IS/on:node nodes start to can send new frame transmit only slot in next slot beginning -ifCo∥ lision;node nodes are retransmits frame in synchronized each subsequent slot ●f2 or more nodes with prob. p until transmit in slot,a‖l success nodes detect collisⅰonSlotted ALOHA Assumptions: • all frames same size • time divided into equal size slots (time to transmit 1 frame) • nodes start to transmit only slot beginning • nodes are synchronized • if 2 or more nodes transmit in slot, all nodes detect collision Operation: • when node obtains fresh frame, transmits in next slot – if no collision: node can send new frame in next slot – if collision: node retransmits frame in each subsequent slot with prob. p until success