Methods, apparatus, and system using multiple antenna techniques for new radio (NR) operations in unlicensed bands

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

• sending, by the WTRU to a network entity, a first Sounding Reference Signal (SRS) associated with a first beam and a second SRS associated with a second beam;
• monitoring, by the WTRU, for information indicating a first power-related metric (PRM) associated with the first SRS and a second PRM associated with the second SRS;
• determining relative gain information for the second beam based on the received PRMs associated with the first and second beams;
• measuring a measurement value of power or energy associated with a channel;
• determining whether the channel is free based on:
• the measurement value of the power or energy, a clear channel assessment (CCA) threshold and the relative gain information;
• and
• transmitting data on condition that the channel is free.