Power metric optimization and uplink DM-RS design for LTE/LTE-A uplink transmissions in unlicensed spectrum

An apparatus for wireless communication, comprising:

• a processor;
• and
• memory coupled to the processor, wherein the processor is configured to:
• receive at a user equipment (UE) a number of allocated interlaces allocated to the UE on a per-UE basis for an uplink transmission over a contention-based shared spectrum, wherein each allocated interlace comprises a plurality of non-contiguous resource blocks of the contention-based shared spectrum in a carrier of a frequency domain;
• generate reference signals for the resource blocks of the allocated interlaces using a reference signal sequence having a reference signal sequence length that is equal to a number of all the resource blocks of all the allocated interlaces;
• map reference signal symbols from the reference signal sequence to the resource blocks of the allocated interlaces based at least in part on an ordering of the resource blocks for the allocated interlaces within the contention-based shared spectrum in the carrier of the frequency domain;
• and
• perform the uplink transmission over the contention-based shared spectrum to a base station, wherein the uplink transmission comprises at least one of the allocated interlaces.

A non-transitory computer-readable medium for storing instructions executable by a processor, comprising:

• instructions to receive at a user equipment (UE) a number of allocated interlaces to the UE on a per-UE basis for an uplink transmission over a contention-based shared spectrum, wherein each allocated interlace comprises a plurality of non-contiguous resource blocks of the contention-based shared spectrum in a carrier of a frequency domain;
• instructions to generate reference signals for the resource blocks of the allocated interlaces using a reference signal sequence having a reference signal sequence length that is equal to a number of all the resource blocks of all the allocated interlaces;
• map reference signal symbols from the reference signal sequence to the resource blocks of the allocated interlaces based at least in part on an ordering of the resource blocks for the allocated interlaces within the contention-based shared spectrum in the carrier of the frequency domain;
• and
• perform the uplink transmission over the contention-based shared spectrum to a base station, wherein the uplink transmission comprises at least one of the allocated interlaces.