Random access protocols When node has packet to send ) Transmit at full channel data rate r > No a priori coordination among nodes Two or more transmitting nodes>collision Random access MAC protocol specifies > How to detect collisions > How to recover from collisions(e.g, via delayed retransmissions) Examples of random access MAc protocols Slotted aloha and Aloha 》 CSMA and CSMa/cD8 8 Random Access Protocols When node has packet to send »Transmit at full channel data rate R »No a priori coordination among nodes Two or more transmitting nodes → “collision” Random access MAC protocol specifies: »How to detect collisions »How to recover from collisions (e.g., via delayed retransmissions) Examples of random access MAC protocols: »Slotted ALOHA and ALOHA »CSMA and CSMA/CD