1. A method for communicating data performed by a wireless transmit/receive unit (WTRU), the method comprising:determining, by the WTRU, that at least one of: control plane data or user plane data is available for transmission to a network;
determining, by the WTRU, that the WTRU is in at least one of: a radio resource control (RRC) IDLE mode or a RRC CONNECTED mode;
determining, by the WTRU, that the WTRU is in an unsynchronized state relative to the network;
determining a spectrum operational mode (SOM) for a transmission, the SOM indicating at least one of: a subcarrier spacing, a transmission time interval (TTI) length, or a waveform for the transmission;
sending the transmission from the WTRU in the unsynchronized state, via a physical uplink channel to the network, the transmission including:
the at least one of the control plane data or the user plane data; and
an uplink timing synchronization request; and
receiving, by the WTRU, at least one of a timing advance command (TAC) or a transmit power command (TPC) from the network in response to the transmission.