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How to Simulate IEEE 802.11p MAC Protocol in NS2?
Source Code

TCL part :

# Change Phy and Mac

set val(netif) Phy/WirelessPhyExt ;# network interface type

set val(mac) Mac/802_11Ext ;# MAC type

# 802.11p parameters

Phy/WirelessPhyExt set CSThresh_ 3.9810717055349694e-13 ;# -94 dBm wireless interface sensitivity

Phy/WirelessPhyExt set Pt_ 0.002 ;# equals 20dBm when considering antenna gains of 1.0

Phy/WirelessPhyExt set freq_ 5.9e+9

Phy/WirelessPhyExt set noise_floor_ 1.26e-13 ;# -99 dBm for 10MHz bandwidth

Phy/WirelessPhyExt set L_ 1.0 ;# default radio circuit gain/loss

Phy/WirelessPhyExt set PowerMonitorThresh_ 3.981071705534985e-18 ;# -174 dBm power monitor sensitivity (=level of gaussian noise)

Phy/WirelessPhyExt set HeaderDuration_ 0.000040 ;# 40 us

Phy/WirelessPhyExt set BasicModulationScheme_ 0

Phy/WirelessPhyExt set PreambleCaptureSwitch_ 1

Phy/WirelessPhyExt set DataCaptureSwitch_ 1

Phy/WirelessPhyExt set SINR_PreambleCapture_ 3.1623; ;# 5 dB

Phy/WirelessPhyExt set SINR_DataCapture_ 10.0; ;# 10 dB

Phy/WirelessPhyExt set trace_dist_ 1e6 ;# PHY trace until distance of 1 Mio. km ("infinity")

Phy/WirelessPhyExt set PHY_DBG_ 0

Mac/802_11Ext set CWMin_ 15

Mac/802_11Ext set CWMax_ 1023

Mac/802_11Ext set SlotTime_ 0.000013

Mac/802_11Ext set SIFS_ 0.000032

Mac/802_11Ext set ShortRetryLimit_ 7

Mac/802_11Ext set LongRetryLimit_ 4

Mac/802_11Ext set HeaderDuration_ 0.000040

Mac/802_11Ext set SymbolDuration_ 0.000008

Mac/802_11Ext set BasicModulationScheme_ 0

Mac/802_11Ext set use_802_11a_flag_ true

Mac/802_11Ext set RTSThreshold_ 2346

Mac/802_11Ext set MAC_DBG 0