Before revision: Recently, IEEE 802.11ax Task Group has proposed new guidelines for the use of OFDMA-based medium access control. In this new framework, it has been decided that the transmission for all the users in an multi-user OFDMA should end end at the same time , and the users with insufficient data should transmit null data (i.e. padding) to fill the duration.
After revision: Recently, IEEE 802.11ax Task Group has adapted OFDMA as a new technique for enabling multi-user transmission. It has been also decided that the transmission for all the users in an multi-user OFDMA should end end at the same time , and the users with insufficient data should transmit null data (i.e. padding) to fill the duration.