Performance Comparison of IEEE 802.11p and IEEE 802.11b for Vehicle-to-Vehicle Communications in Highway, Rural, and Urban Areas

Table 2

PHY layer values of IEEE 802.11b and IEEE 802.11p [7].

Parameters	IEEE 802.11b	IEEE 802.11p
Channel bandwidth	20 MHz	10 MHz
Data rates	1 to 11 Mbps	3 to 27 Mbps
Slot time	20 μs	16 μs
SIFS time	10 μs	32 μs
Preamble length	96 μs (short), 192 μs (long)	32 μs
Air propagation time	<2 μs	<4 μs
CWmin	31	15
CWmax	1023	1023