Methods, devices and systems for grant-less uplink multiple access

A wireless transmit/receive unit (WTRU) for multiple access wireless communications, the WTRU comprising:

• a transceiver configured to receive a configuration of a set of grant-less Physical Uplink Shared Channel (GL-PUSCH) frequency resources;
• the transceiver operatively coupled to a processor, the transceiver and the processor configured to monitor for a downlink control information (DCI) message, wherein the DCI message includes an indication of a presence of at least a subset of the set of GL-PUSCH frequency resources;
• the processor configured, on a condition of successful reception of the DCI message, to select one or more GL-PUSCH frequency resources from the subset of the set of GL-PUSCH frequency resources and a time period;
• the transceiver configured to transmit data on a GL-PUSCH using the selected one or more GL-PUSCH frequency resources during the selected time period;
• the processor configured to determine a time location for reception of hybrid automatic repeat request acknowledgement (HARQ-ACK), associated with the transmitted GL-PUSCH data, based on the selected one or more GL-PUSCH frequency resources;
• and
• the transceiver and the processor configured to monitor for reception of the HARQ-ACK during the determined time location.