Patent ID: 9749975
Date: 2017-08-29
CPC Classifications: H04L,H04W

Claim:
1. An access point comprising: a generation circuit configured to generate a synchronization signal; a transceiver configured to (i) transmit the synchronization signal to a station, and (ii) receive a medium access control protocol data unit based on the synchronization signal during a transmit opportunity period for the station; and an acknowledgment circuit configured to generate an acknowledgment signal based on the reception of the medium access control protocol data unit, wherein the synchronization signal or the acknowledgment signal includes a null data packet frame, wherein the null data packet frame comprises a legacy signal field and a non-legacy signal field, wherein the legacy signal field comprises a length of a portion of the null data packet frame subsequent to the legacy signal field, wherein the legacy signal field or the non-legacy signal field indicates a remaining duration of the transmit opportunity period for the station, and wherein the transceiver is configured to transmit the acknowledgment signal to the station.