# Re: Looking for 802.11 MAC & PHY Package **URL:** \ **Category:** GNU Radio\ **Created:** [October 10, 2014, 6:25pm UTC](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464 "2014-10-10T18:25:24Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [October 10, 2014, 6:25pm UTC](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464/1 "2014-10-10T18:25:24Z")
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 [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![ZhangS\_Jiayi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/e95f7d/32.png) [@ZhangS\_Jiayi](https://www.ruby-forum.com/u/ZhangS_Jiayi)\ **Post date:** [October 15, 2014, 1:08pm UTC](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464/2 "2014-10-15T13:08:43Z")
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 > **[Literature Database Entry - Distributed Embedded Systems](https://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 ---
**Author:** ![ZhangS\_Jiayi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/e95f7d/32.png) [@ZhangS\_Jiayi](https://www.ruby-forum.com/u/ZhangS_Jiayi)\ **Post date:** [October 16, 2014, 11:52am UTC](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464/3 "2014-10-16T11:52:07Z")
Is it possible to do 11ac on SDR? ---
**Author:** ![ZhangS\_Jiayi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/e95f7d/32.png) [@ZhangS\_Jiayi](https://www.ruby-forum.com/u/ZhangS_Jiayi)\ **Post date:** [October 20, 2014, 9:39am UTC](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464/4 "2014-10-20T09:39:02Z")
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 ---
**Author:** ![ZhangS\_Jiayi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/e95f7d/32.png) [@ZhangS\_Jiayi](https://www.ruby-forum.com/u/ZhangS_Jiayi)\ **Post date:** [October 21, 2014, 8:33am UTC](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464/5 "2014-10-21T08:33:10Z")
Learn 802.11. hehe.