Systems, methods, and instrumentalities are disclosed for a wireless transmit/receive unit (WTRU) receiving a first set of one or more initial access signals from a Transmission/Reception Point (TRP), wherein the first set of one or more initial access signals indicates that the TRP is in a dormant state, sending an echo signal to the TRP, wherein one or more transmission parameters of the echo signal are derived from the first set of one or more initial access signals received from the TRP, monitoring for a second set of one or more initial access signals from the TRP after transmitting the echo signal, and receiving the second set of one or more initial access signals, the second set of initial access signals comprising information associated with accessing the TRP. Sets of one or more initial access signals may be received from a plurality of TRPs in an area. The second set of one or more initial access signals may be received from a TRP that is closest to, or has a strongest signal strength for transmitting to, the WTRU.