[ns] Is there any PCF operation implemented in NS ?

[taraka praveen]

Hi friends,
   
   I have to work in MAC layer for my project.I want to use PCF opeartion.Is it 
already implemented ?Please tell me the NS version .I am using NS-2.28 .In that 
version i didn't find PCF operation.
   
  Actually if we want to sense the channel in MAC operation in NS in which way 
we are able to sense the channel ? Whether we are using any conditions for 
checking the channel availability ?
   
  please suggest me 
   
  Thanks in advance,
  Tarakarpaveen Uppalapati Goud

                                
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