Using the TwoRayGround reflection model and while keeping the transmission power (Pt) fixed, (in my case 0.281838 W), I have the following question:
When changing the receiver sensitivity by setting (RXThreshold), we can control the transmission distance. I have built a fifty nodes broadcast scenario in the form of two straight lines, each having a fixed inter-nodes distance.
1) While setting the transmission distance to 301m (i.e. Pt = 0.281838 W, RXThreshold = 1.7382e-10) and inter-nodes distance to 300m, broadcast packets are received.
2) But, while setting the transmission distance to 51m (i.e. Pt = 0.281838 W, RXThreshold = 7.39247e-08) and inter-nodes distance to 50m, broadcast packets are NOT received. To create a successful communication in this scenario, I need to set-up a transmission distance of around 110m, through nodes exist at the distance of 50m!
This issue keeps on repeating for all scenarios involving small transmission distances and while nodes very much exists within the transmission range.
I'm very much clueless on this issue, any suggestions would be appreciated.
Regards,
Osama Rehman
it seems strange,
if you are using the tool ~ns/indep-utils/propagation/threshold.cc then you will get the accurate values for RXThresh_ based on the intended propagation model, and the transmission power.
here an example: http://hpds.ee.ncku.edu.tw/~smallko/ns2/range_en.htm
if you have set the correct values,and you did not get the intended communication behavior, then, it is strange,and you have to check if you are already set other parameters in the scenario that is different from the default ones.
Good Luck
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