Carrier sense multiple access with collision resolution

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Presentation transcript:

Carrier sense multiple access with collision resolution IEEE communications letters Hyun-Ho Choi, Jung-Min Moon, In-Ho Lee, and Howon Lee

CSMA/CD A transmitting station can detect a collision while transmitting However, the CSMA/CD protocol is only possible in a wired network A wireless network has deafness problem (the receiver of the transmitting station is overwhelmed by its own transmission power)

Wireless CSMA/CD (WCSMA/CD) Each station allocates a short CD slot randomly within a fixed CD period Senses the channel at the selected CD slot to determine whether a collision occurs or not

CSMA/CR It extends the WCSMA/CD protocol CSMA/CR protocol identifies a collision by additional sensing after data transmission starts One station that first detects a collision transmits a jam signal

CSMA/CR No collision occurs

CSMA/CR A collision is detected

Cases of a collision is not detected in CSMA/CR

Cases of a collision is not detected in CSMA/CR

Implementation issue 802.11 standard defines a slot time (aSlotTime) as a basic time unit required for the channel sensing and accessing For the CSMA/CR, a CD slot time (aCDSlotTime) should satisfy

Throughput analysis From theh Bianchi’s CSMA/CA analysis, - the probability that in a slot time there is at least one transmission - the probability that a transmission is successful - the probability that a transmission is collided

Throughput analysis The collision probability of - WCSMA/CD - CSMA/CR

Throughput analysis The collision detection probability of WCSMA/CD The collision resolution probability of CSMA/CR

Normalized throughput