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allke0527Dear sir:
The coverage of the basestation in NS looks like defined by the signal strength but I couldn’t understand the transformation between signal strength and coverage, such as why the following represent the 500m coverage
Phy/WirelessPhy set Pt_ 0.025
Phy/WirelessPhy set RXThresh_ 2.025e-12 ;#500m radius
Phy/WirelessPhy set CSThresh_ [expr 0.9*[Phy/WirelessPhy set RXThresh_]]
Could you give me some advice about how to calculate the exact coverage of the bastation please? Besides, since the Pt_ is the transmission power and RXThresh_ is the receive power threshold in Watts, what about CSThresh_?
If the coverage of the bastation is fixed, does it mean the handover position for the mobile node is fixed too?
Many thanks in advance
Howie
CharlesPandianIf the transmission power is very low, then the nodes will not receive
anything and hence could not involve in any communication. the following
table can be used for calculating the distance with respect to the Pt_ , and
it is a rough estimate.
Let us assume that a receiving node is set at this following parameters.
Phy/WirelessPhy set RXThresh_ 630e-15
Phy/WirelessPhy set CSThresh_ 630e-15
This means, that node only consider a carrier signal which is having energy
630e-15 or higher and forward the received frame if the signal energy is
630e-15 or higher.
By increasing transmission power, the signal may reach a node but it will be
ignored if the signal strength is less than RXThresh_ or CSThresh_ at
receiving end.
allke0527Thanks very much for your reply and your help. But can you tell me how to calculate the coverage and how can you get Pt_=0.2891 is for 250m so that I can calculate the coverage I want such as 50m.
And does it mean that the coverage of the basestation is just defined by these three factors?
And another very important question which is always bothering me. In the coverage area of the bstation, is the signal strength always constant? Or it will go down along with the increase of distance.
Thanks very much in advance!
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