Re: [Discuss-gnuradio] m-block timeouts, time passed, or

[David Li]

Hi George,
 
 I am interested in your MAC work. Does it run in the kernel or user
 space? Does it interact with IP?
 
 Is there a branch that I can download and play with it? I have two USRP
 2400 boxes.
 
 Thanks.
 
 - David Li
 
 
> 
> Eric Blossom wrote:
>   > What your asking for would be hard to do using the existing
> framework.
>> I still don't understand where you want to do this from.  That is,
>> which code would be making the determination that it was time to
pause
>> or unpause the timer.
>>
> 
> For instance, a new node enters a backoff state and decides that it 
> needs to wait for the channel to be idle for 10ms before it can
> transmit 
> (802.11 like).  It starts a one shot timer for 10ms, and with each
new 
> RSSI reading from the PHY, which comes at variable times due to 
> processing and queues, the protocol checks if the new RSSI reading is 
> greater than some CCA threshold.  If it's greater, it needs to pause
> the 
> timer because the timer represents the time at which the node must
wait 
> when the channel is idle, not busy.  Once the RSSI drops below the
CCA 
> threshold, it can then resume the timer.  Once the timer fires, the
> node 
> attempts to transmit.
> 
> - George
> 
> 
> 
> 
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