Methods for wireless communication in higher frequencies

A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

• receiving configuration information identifying one or more channel state information (CSI) reference signal (CSI-RS) resources in a first frequency range (FR), wherein at least one of the CSI-RS resources in the first FR is associated with one or more CSI-RS resources in a second FR and the second FR is a lower FR than the first FR;
• measuring a signal quality of the one or more CSI-RS resources in the first FR;
• selecting a subset of the one or more CSI-RS resources in the first FR;
• on a condition the measured signal quality of at least the selected subset of the one or more CSI-RS resources in the first FR is lower than a threshold:
• measuring a respective signal quality of each of the one or more CSI-RS resources in the second FR that are associated with the selected subset of the one or more CSI-RS resources in the first FR;
• and
• sending a report including one or more of:
• the respective signal quality for each of the CSI-RS resources in the second FR that are associated with the selected subset of CSI-RS resources in the first FR;
• or an indication of the one or more CSI-RS resources in the second FR that are associated with the selected subset of the one or more CSI-RS resources in the first FR.

A wireless transmit/receive unit (WTRU) comprising:

• a processor;
• and
• a transceiver;
• the transceiver configured to receive configuration information identifying one or more channel state information (CSI) reference signal (CSI-RS) resources in a first frequency range (FR), wherein at least one of the CSI-RS resources in the first FR is associated with one or more CSI-RS resources in a second FR and the second FR is a lower FR than the first FR;
• the processor and the transceiver configured to measure a signal quality of the one or more CSI-RS resources in the first FR;
• the processor configured to select a subset of the one or more CSI-RS resources in the first FR;
• on a condition that the measured signal quality of at least the selected subset of the one or more CSI-RS resources in the first FR is lower than a threshold:
• the processor and the transceiver are configured to measure a respective signal quality of each of the one or more CSI-RS resources in the second FR that are associated with the selected subset of the one or more CSI-RS resources in the first FR;
• and
• the processor and the transceiver are configured to send a report including one or more of:
• the respective signal quality for each of the CSI-RS resources in the second FR that are associated with the selected subset of CSI-RS resources in the first FR;
• or an indication of the one or more CSI-RS resources in the second FR that are associated with the selected subset of the one or more CSI-RS resources in the first FR.