Slotted aloha Time is divided into"slots"of one packet duration E. g, fixed size packets When a node has a packet to send it waits until the start of the next slot to send it Requires synchronization If no other nodes attempt transmission during that slot, the transmission is successft Otherwise“ collision” Collided packet are retransmitted after a random delay Success Collision Success Eytan ModianoSlotted Aloha • Time is divided into “slots” of one packet duration – E.g., fixed size packets • When a node has a packet to send, it waits until the start of the next slot to send it – Requires synchronization • If no other nodes attempt transmission during that slot, the transmission is successful – Otherwise “collision” – Collided packet are retransmitted after a random delay 1 2 3 4 5 Success Idle Collision Idle Success Eytan Modiano Slide 6