[OpenWrt-Devel] IEEE 802.11 TDMA mode support in OpenWRT

Fernando Frediani fhfrediani at gmail.com
Fri Jul 4 09:49:35 EDT 2014

Hi Ben,

TDMA doesn't require synchronization between the radios. This would be 
Ubiquiti's AirSync technology and that's for another usage. When you 
have two or mode radios colocated in a tower receiving and transmitting 
at the same time so it avoids them do it at the same time and 
synchronizes Receive and Transmit.

TDMA is more to be used in PtMP environments where you have multiple 
customers talking to the AP and they don't see each other, so the AP is 
able to organize more correctlly the time each one sends data. That's 
probably why it was only implements on proprietary systems usede by 
WISPs with different names.



On 03/07/2014 19:59, Ben West wrote:
> In an old thread on the Battlemesh listserv about strategies for 
> dealing with a mix of strong / weak clients for PtMP, someone offered 
> this pointer for JaldMAC, an open 802.11 polling implementation in ath9k:
> http://matthias.vallentin.net/papers/nsdr10.pdf
> https://github.com/shaddi/jaldimac/commits/master
> Unfortunately, that repo has sat idle for over 2 years, and I believe 
> it it was more a proof of concept rather than a usable implementation.
> Also, i believe TDMA requires very tight synchronization between all 
> radios, hence the inclusion of GPS modules on proprietary implementations.
> On Thu, Jul 3, 2014 at 11:02 AM, Fernando Frediani 
> <fhfrediani at gmail.com <mailto:fhfrediani at gmail.com>> wrote:
>     Hi all,
>     Is anyone aware of any implementation of TDMA mode support in
>     OpenWRT (similar to Ubiquiti's AirMAX, Deliberant's iPoll or
>     MikroTik's NV2, etc)
>     Would that have to be implemented having in mind the radio driver
>     or could it possible also be implemented in any router ?
>     This is certanlly something significant for more throughput
>     demanding and crowded environments.
>     Best regards,
>     Fernando
>     _______________________________________________
>     openwrt-devel mailing list
>     openwrt-devel at lists.openwrt.org
>     <mailto:openwrt-devel at lists.openwrt.org>
>     https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
> -- 
> Ben West
> http://gowasabi.net
> ben at gowasabi.net <mailto:ben at gowasabi.net>
> 314-246-9434

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