Cognitive radio networks using two MAC protocols
Qingmin Meng · Information technology newsletter · 2011
Both slotted Aloha and CSMA are efficient random access protocols,which can form a more advanced media access protocol.This paper studied the utilization of slotted Aloha and CSMA in cognitive radio networks.Primary users have higher priority than secondary users,and secondary users need to detect channel to avoid interference with primary users.Therefore,primary users access the channel by slotted Aloha,secondary users detect idle time slots of slotted Aloha by CSMA,and transmit data in these time slots.