hi all, regarding 802.11, ns-2 uses some Thresholds to determine whether or not a frame is received correctly by the mobile station. in other words, there are two thresholds values: 1. CSThreshold_ and is set to 1.559e-11 2. RXThershold_ and is set to 3.652e-10
they are interpreted as follows: if the signal strength of a frame is less than CSThreshold_, then this frame will be discarded by the physical module and won't be visible to the MAC layer. if the signal strength of a frame is less than RXTheshold_, then this frame will be marked as corrupted and consequently, MAC will discard it. ELSE, the frame will be received correctly.. in addition, in ns-2, the transmission range is set to approximately 250 m...and the distCST_ is 550 m.... my question is, why is this huge difference? as this will affect the performance...and is it required by the standard? I just couldn't find anything supporing this issu.....I would appreciate it, if anyone could tell me where I can find any explanation about this issue.. looking forward to any help. -- Best regards, Ashraf Bourawy
