Wednesday, July 19, 2017

WiFi: PER based adaptive AMSDU aggregation worth the effort?

This has been a lingering question. A lot of studies (including one of ours) in the past has delved into the support for AMSDU aggregation - and the ability to consider PER as a factor for adaptively controlling AMSDU aggregation. But is it worth the computational effort? Can this be simplified by making AMSDU aggregation static and using other mechanisms for limiting PER?
Abstract of the paper: Frame aggregation is a mechanism by which multiple frames are combined into a single transmission unit over the air. Frames aggregated at the AMSDU level use a common CRC check to enforce integrity. For longer aggregated AMSDU frames, the packet error rate increases significantly for the same bit error rate. Hence, multiple studies have proposed doing AMSDU aggregation adaptively based on the error rate. This study evaluates if there is a \emph{practical} advantage in doing adaptive AMSDU aggregation based on the link bit error rate. Evaluations on a model show that instead of implementing a complex adaptive AMSDU frame aggregation mechanism which impact queuing and other implementation aspects, it is easier to influence packet error rate with traditional mechanisms while keeping the AMSDU aggregation logic simple.

G. Bhanage, "Case For Static AMSDU Aggregation in WLANs," arXiv preprint arXiv:1707.02701,, July 2017.

  title={Case For Static AMSDU Aggregation in WLANs},
  author={Bhanage, Gautam},
  journal={arXiv preprint arXiv:1707.02701},