Slotted AloHA To improve efficiency a modification of ALOHA known as slotted ALOHA, was developed Time is organized into uniform slots whose size equals the frame transmission time -Need a central clock ( or other sync mechanism) Transmission begins only at a slot boundary -Consequence: frames either miss or overlap totally Maximum channel utilization can be improved to about 37%6 Slotted ALOHA • To improve efficiency, a modification of ALOHA, known as slotted ALOHA, was developed. • Time is organized into uniform slots whose size equals the frame transmission time —Need a central clock (or other sync mechanism) • Transmission begins only at a slot boundary —Consequence: frames either miss or overlap totally • Maximum channel utilization can be improved to about 37%