[Ns-developers] question about IEEE 802.11 implementation in ns 2.26

[shamim]

Hi,

According to 802.11b specification (chapter 9.2 of the spec):

When a node overhears RTS/CTS destined for others, it schedules a NAV
timer to defer access to the channel for the entire duration ther time is
running. During that period the node drops (silently) any RTS destined for
it.

But it looks like that the implementation in ns-2 never run into such
situation. Even a node receives an RTS while its NAV is running, the
eventual recvRTS routine is called after the NAV expires, and therefore,
the node does not silently drop the RTS.

I was just wondering if 1) this is an implementation bug? or 2) the
version of 802.11 implemented in ns does not necessarily should do silent
drop...

Any help regarding this issue is appreciated.

Thanks,

-----------------------------------------------

Shamim Begum
PhD Student, Electrical Engineering Department
University of Southern California
http://www-scf.usc.edu/~sbegum

-----------------------------------------------