Contention window adjustment mechanisms for felaa systems

An apparatus of a user equipment (UE) to operate in a License Assisted Access (LAA) system, comprising:

• one or more baseband processors to decode a configuration from a Fifth Generation NodeB (gNB) of a transmission initiation time interval contention window size (CWS) of N number of subframes between Category 4 Listen Before Talk (LBT) uplink (UL) transmissions in the LAA system;
• and
• a memory to store a value of N.

One or more non-transitory machine readable media having instructions thereon that, when executed by an apparatus of a user equipment (UE) to operate in a License Assisted Access (LAA) system, result in:

• decoding a configuration from a Fifth Generation NodeB (gNB) of a transmission initiation time interval contention window size (CWS) of N number of subframes between Category 4 Listen Before Talk (LBT) uplink (UL) transmissions in the LAA system;
• and
• generating a subsequent LBT UL transmission N number of subframes after a previous LBT UL transmission.

An apparatus of a Fifth Generation (5G) NodeB (gNB) to operate in a License Assisted Access (LAA) system, comprising:

• one or more baseband processors to decode uplink control information (UCI) from an autonomous uplink (AUL) transmission received from a user equipment in the LAA system, wherein the UCI indicates that a next subframe is a last subframe of the AUL transmission and a remaining portion of a maximum channel occupancy time (MCOT) of the UE is available to be shared by the gNB;
• and
• a memory to store the UCI.