Carrier sensing multiple access with collision resolution (CSMA/CR) protocol for next-generation wireless LAN

This paper proposes a distributed medium access control (MAC) protocol called carrier sensing multiple access with collision resolution (CSMA/CR) based on a fully connected single hop network considering next-generation wireless LAN environments with a high density of stations. The proposed CSMA/CR follows the typical CSMA/CA protocol and identifies a collision by additional sensing after data transmission starts without a ready-to-send (RTS) and clear-to-send (CTS) exchange. If one station detects a collision, it transmits a jam signal to stop the other stations´ transmissions and has access priority for the retransmission without backoff, which prevents the next collision that may occur. The simulation results show that the proposed CSMA/CR has a low overhead due to the detection of a collision without an RTS/CTS exchange and always achieves the best throughput regardless of the number of access stations by using the collision resolution scheme.