[ns] Help is needed plaese regarding ns-2 nodes communication

[Ghada Al-Mashaqbeh]

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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