Re: Looking for 802.11 MAC & PHY Package

GNU Radio
1

Dear Marcus and Bloessl,

Thanks for the reply. I also notice the fully functional gr-ieee802-11
package provide by Bloessl. Previously I thought it’s only PHY, but as
Marcus mentioned it also include MAC. It seems to me in the
gr-ieee802-11-master package, the MAC does not run csma. I also find the
gr-ieee802-11-csma package, which is smaller than the master package but
indicate “csma” in name and one of examples. After checking the Readme
and
other pulications from WIME project, I cannot find detail description
regarding the MAC and CSMA function for the package.

  1. Does the csma package should be used with the master package?
  2. Does the csma package support multiple nodes in an ad-hoc network?

Return to Marcus’s advice, do you mean that to realize the MAC (CSMA),
we
still need implement FPGA (not the one in USRP?) to handle it in
hardware,
no matter we use the software lib, e.g. GRU Radio or Click Module
Router?

Many thanks for your help again!

Best regards,
Jiayi

On Thu, Oct 9, 2014 at 4:05 PM, Marcus Müller [email protected]

2

Hi,

On 10/10/2014 06:20 PM, Zhang, Jiayi wrote:

Dear Marcus and Bloessl,

Thanks for the reply. I also notice the fully functional gr-ieee802-11
package provide by Bloessl. Previously I thought it’s only PHY, but as
Marcus mentioned it also include MAC. It seems to me in the
gr-ieee802-11-master package, the MAC does not run csma. I also find the
gr-ieee802-11-csma package, which is smaller than the master package but
indicate “csma” in name and one of examples.

Sorry, I don’t get what you mean with smaller. Are you talking about the
file size of the sources?
All branches add / parse the MAC header as defined in the standard. So
the frame format is OK on all branches. The ‘csma’ branch implements
channel access for broadcast frames.

After checking the Readme
and other pulications from WIME project, I cannot find detail
description regarding the MAC and CSMA function for the package.

It’s the one at the top
http://www.ccs-labs.org/bib/bloessl2014timings/

  1. Does the csma package should be used with the master package?

No. ‘csma’ is the name of a branch. You would checkout and use that
branch.

  1. Does the csma package support multiple nodes in an ad-hoc network?

The CSMA implementation is for broadcast frames only. So depends on what
you want to do.

Return to Marcus’s advice, do you mean that to realize the MAC (CSMA),
we still need implement FPGA (not the one in USRP?) to handle it in
hardware, no matter we use the software lib, e.g. GRU Radio or Click
Module Router?

To support CSMA functionality you will have to change the FPGA otherwise
you will not be able to meet the timing constraints of 802.11. For the
broadcast case you only need some small changes.
If you want to support ACKS and RTS/CTS you need a lot of functionality
on the FPGA. In my opinion this will not happen on a N210, but AFAIK
Ettus has a 802.11 implementation for RFNoC (i.e. for the FPGA) which
most likely meets all timing constraints.

Best,
Bastian

3

Is it possible to do 11ac on SDR?

4

On 10/16/2014 11:50 AM, Vanush V. wrote:

Is it possible to do 11ac on SDR?

Vanush,

the answer to any question of the type “can we do standard X on SDR”
is always ‘yes’.

Are you planning to do this yourself, or are you looking for a finished
solution? Also, what’s your goals?

M

5

Learn 802.11. hehe.