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[Discuss-gnuradio] 802.11 Question

From: Steve Glass
Subject: [Discuss-gnuradio] 802.11 Question
Date: Thu, 7 Jun 2007 13:43:25 +1000


I'm considering using the USRP together with the 802.11 stack to prototype some 802.11 MAC layer changes. I'm sending from an 11b card at the base rate to my USRP/RFX2400.

One shortcoming at present is that the code doesn't generate ACKs for received frames. There are quite strict timing requirements for ACK generation: for 11b at the base rate the ACK should be sent within a period measured in microseconds. I can increase the ACKTimeout but apparently there's a hard limit in my 802.11 equipment at 746us beyond which I will incur a rentransmission.

I'm prepared to wade into the code but its a fool's errand if  the latencies will be too high to ACK within a few hundred microseconds. I'm worried that the block latencies and USB round-trip delay would seem to make this impossible. If anyone here can give me an informed opinion then I'll be really happy. So, does anyone know if it is it possible to generate an ACK within 700us or so of receiving a data frame?

Kind regards


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