[Ns-developers] progress on wireless PHY

[Ruben Merz]

Mathieu,

[snip]

> the 'channel' setting also needs to be configured for reception: the phy
> needs to know on which channel it is listening to (unless it has
> multiple radio receivers each of which can listen to a different
> channel). So, are you suggesting that we add:
>   - a channel argument to the Send method
>   - a SetListeningChannel method 

Yes. And for the moment, let's make it simple and assume that we can 
only listen to on one channel at a time. Because, with CDMA or UWB or 
even narrow band radios (like 802.11), you could listen to on several 
"channels" at a time (several code, or several frequencies). But this is 
something we should have at some point.

> 
> i.e., is it possible for a PHY to be listening on a given channel and
> send a packet on another channel ? This seems rather unlikely to me in
> which case, I would lean towards a single SetChannel method used to set
> the sending and listening channel at the same time.

No, it is not feasible if you have a single radio with a single RF chain 
and a single antenna. You would probably have to have two radios to do it.

BTW, this would be a nice feature for ns-3 in the long term to be able 
to attach two or more PHYs.

Best,
Ruben