Timing advance design for enhanced component carrier

An apparatus for wireless communication, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• identify a length of a filler signal based at least in part on a maximum allowed length of the filler signal configured by a base station;
• transmit the filler signal of the identified length to reserve access to a shared radio frequency (RF) spectrum band, the filler signal transmitted during a transmission gap that occurs between a downlink (DL) transmission and an uplink (UL) transmission in time division duplex (TDD);
• and
• transmit the UL transmission on the reserved shared RF spectrum band subsequent to the transmission of the filler signal.

An apparatus for wireless communication, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• determine, by a base station, a maximum allowed length of a filler signal for a coverage area of the base station, the base station configured to communicate with a plurality of UEs within the coverage area on a shared RF spectrum band using TDD;
• and
• transmit, to at least one of the UEs, the maximum allowed length of the filler signal and authorization to attempt to reserve the shared RF spectrum band by transmitting the filler signal during a transmission gap subsequent to an end of a DL transmission.