Hi all,
I am simulating a static single-channel ad-hoc network in whch the
transmission range is set to 150m and the interference range is set to 300m
(using thershold tool in ns-2). The used protocol is AODV, what I have noticed
that brodacasted packets can be heard successfully from nodes at distance >
150m (about 200m). This has created the problem that RREQ set paths between
nodes with hop distance of around 200m, when this node used the stored path
toward the source to send the RREP the RREP will be dropped (not heard by the
node that lie on distance > 200m). nodes are oranized in a gird with distance
between adjacent nodes = 100m, I have tried to reduce this distance and to
increase it but the performance is still very poor.
Can anybody explain things to me.
settings of communication are as follows:
/*-------------------------------------------------------------
Phy/WirelessPhy set CPThresh_ 10.0 ;# capture threshold
Phy/WirelessPhy set CSThresh_ 2.312e-11 ;# Carrier Sensing
threshold, 300 m is the interference range
Phy/WirelessPhy set RXThresh_ 1.533e-10 ;# receiver signal
threshold, 150 m is the transmission range
Phy/WirelessPhy set bandwidth_ 11Mb ;# channel bandwidth
(UNUSED!)
Phy/WirelessPhy set Pt_ 0.037 ;# transmitter signal power
(Watt), for 150 m transmission range
Phy/WirelessPhy set freq_ 2.472e9 ;# channel frequency
(Hz)
Phy/WirelessPhy set L_ 1.0
-------------------------------------------------------------------*/
Thanks in advance,
Ghada
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