In this episode, we provide an overview of many parts contained in 802.11ax. It’s meant to provide a quick update as to what is coming in 802.11ax. You can expect that we will cover these items in future episodes.
A new way of handling transmissions for Wi-Fi is by turning OFDM into multi-user by using OFDMA. It’s borrowed from the cellular world and adds efficiency to Wi-Fi. This is one of the fundamental concepts to understand for 802.11ax.
Another new concept to 802.11ax is this idea of using a BSS Color. It’s used for dense environments and allows for OBSS. Kind of looks like RXSOP. There’s actually no colors used. It’s just 1s and 0s.
With OFDMA, the subcarriers are much different compared to 802.11ac. There are a lot more subcarriers for multi-user OFDM. More transmissions to send and receive across a channel width. François goes into the details of subcarriers for OFDMA for this episode.
All the current power saving mechanisms defined today remain usable with ax. In addition, the 802.11ax draft defines a new mechanism called Target Wake Time or TWT. Target wake time (TWT) is used to help minimize contention between clients and reduce the amount of time a client in power save mode to be awake.
It’s not all-new ways of thinking about channel access but 802.11ax does add some complexity. We are now dealing with multi-access, TXOP, BSS coloring which complicates the channel access process.
We have more episodes in the hopper… reading the draft takes time. Interpreting and understanding takes longer…