Timing advance validation techniques for L1/L2 inter-cell mobility

A method of wireless communication at a user equipment (UE), comprising:

• transmitting, at a first time instance, an indication of a first measurement on at least one downlink reference signal (DL-RS) associated with a first cell, wherein the first cell is included in a layer 1 (L1) mobility configured cell set or a layer 2 (L2) mobility configured cell set;
• receiving, at a second time instance after the first time instance, an estimated timing advance (TA) associated with the first cell;
• performing a second measurement on the at least one DL-RS;
• and
• accepting or rejecting the estimated TA for communication with the first cell based on at least one of the first measurement or the second measurement.

An apparatus for wireless communication at a network entity, comprising:

• memory;
• and
• at least one processor coupled to the memory and, based at least in part on information stored in the memory, the at least one processor is configured to:
• receive, at a first time instance, an indication of a first measurement on at least one downlink reference signal (DL-RS) associated with a first cell, wherein the first cell is included in a layer 1 (L1) mobility configured cell set or a layer 2 (L2) mobility configured cell set;
• estimate a timing advance (TA) associated with the first cell based on the first measurement on the at least one DL-RS;
• and
• transmit, at a second time instance after the first time instance, the estimated TA associated with the first cell.

A method of wireless communication at a network entity, comprising:

• receiving, at a first time instance, an indication of a first measurement on at least one downlink reference signal (DL-RS) associated with a first cell, wherein the first cell is included in a layer 1 (L1) mobility configured cell set or a layer 2 (L2) mobility configured cell set;
• estimating a timing advance (TA) associated with the first cell based on the first measurement on the at least one DL-RS;
• and
• transmitting, at a second time instance after the first time instance, the estimated TA associated with the first cell.