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Re: [ns] throughput problem
RTS/CTS/ACK will add considerable overheads if packet size is small.
1) If rts/cts/ack is used, the whole process involved is given by(backoff is
removed):
DIFS+RTS+SIFS+CTS+SIFS+DATA+SIFS+ACK
2) If all the schemes are disabled, the whole process is give by:
DIFS+DATA
The latter one cause less time to send a MAC SDU.
Am I understand your question correctly?
----- Original Message -----
From: "Kai Li" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Tuesday, September 25, 2001 9:36 AM
Subject: Re: [ns] throughput problem
> Thanks but I still can't get it why use rts/cts/ack get lower throughput
than I
> don't use them.
>
> I just want to send data packet only once and check how many data packets
> collision occur. I think disable ack will not have big influence since for
the
> source it will not retransmission and for destination it will not send ack
and
> just pass the data packet to link layer. As to the packet size, I try to
use
> 512 bytes and 5 bytes. Both give me higher throughput without rts/cts/ack
than
> mac with rts/cts/ack.
>
> -
>
>