check in the recv_timer() function
http://www.ece.rice.edu/~jpr/ns/docs/802_11.html#recv_timer()
On 8/29/06, Utente ns2 <[EMAIL PROTECTED]> wrote:
>
> Dear friends,
>
> look at the following code , extracted from the file wireless-phy.cc :
>
> if(propagation_) {
> s.stamp((MobileNode*)node(), ant_, 0, lambda_);
> Pr = propagation_->Pr(&p->txinfo_, &s, this);
> if (Pr < CSThresh_) { // This is the sensitivity of the
> wireless card
> pkt_recvd = 0;
> goto DONE;
> }
> if (Pr < RXThresh_) {
> /*
> * We can detect, but not successfully receive
> * this packet.
> */
> hdr_cmn *hdr = HDR_CMN(p);
> hdr->error() = 1;
> }
> }
>
> One question about RXThresh_:
> if CSThresh_ < Pr < RXThresh_ we have that:
> A. pkt_recvd = 1 (the packet will be sent to the MAC Layer - thank you
> again, Joshua :-) )
> B: the packet is marked with hdr->error() = 1 .
> In the case Pr > RXThresh_ we will have that:
> A. pkt_recvd = 1 (the packet will be sent to the MAC Layer)
> B. hdr->error() is untouched, it is equal to 0
>
> So, the only difference introduced in the status of the packet by the
> RXThreshold is the flag 0/1 in the common header field.
>
> What I haven't understood is how MAC treats the above different kind of
> packets.
> It seems that at MAC level no difference is done between packet with
> hdr->error() = 0 and hdr->error() = 1.
> My guess is that once again the solution is in some inherited classes... but
> I really cannot see where...
>
> I hope you can give me some hints.
>
> Regards,
>
> Pasquale
>
> _________________________________________________________________
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>
>
