ISO/IEC 8802-11:2005 pdf download

ISO/IEC 8802-11:2005 pdf download.lnformation technology - Telecommunications and information exchange between systems -Local and metropolitan area networks-Specific requirements Part 11: Wireless LAN Medium Access Control(MAC)and Physical Layer (PHY) specifications.

When the source STA transmits a fragment, it shall release the channel, then immediately monitor the channel for an acknowledgment as described in 9.2.8.
When the destination STA has finished sending the acknowledgment, the SIFS following the acknowkdgment shall be reserved for the source STA to continue (if necessary) with another fragment. The STA sending the acknowledgment shall not transmit on the channel immediately following the acknowledgment.
The process of sending multiple fragmcnis after contending for the channel is defined as a fragment burst.
If the source STA receives an acknowledgment but there is not enough time to transmit the next fragment and receive an acknowledgment due to an impending dwell boundary, the source STA shall contend for the channel at the beginning of the next dwell time.
If the source STA does not receive an acknowledgment frame, it shall allempt to retransmit the failed MPDU or another eligible MPDL as defined in 9,8, after performing the backoff’procedure and the contention process.
After a STA contends for the channel to retransmit a fragment of an MSDIJ, it shall start with the last fragment that was not acknowledged. The destination STA shall receive the fragments in order (because the source sends them in order and they are individually acknowledged). It is possible, however, that the destination STA may receive duplicate fragments. It shall be the responsibility of the receiving STA to detect and discard duplicate fragments.
A STA shall transmit after the SIFS only under the following conditions during a fragment burst:
The STA has just received a fragment that requires acknowledgment.
The source STA has received an acknowledgment for a previous fragment. has more fragment(s) for the same MSDU to transmit, and there is enough time before the next dwell boundary to send the next fragment and receive its acknowledgment.