Question: During a handover in a TDD (Time Division Duplex) system, how is the new Timing Advance (TAnew) calculated for the UE's uplink transmission in the target cell?
Option 1: TAnew = TAold - t, where t is the relative timing difference between the new and old cells.
Option 2: TAnew = TAold + 2t, where t is the relative timing difference (SFN-SFN observed time difference type 2) between the new and old cells.
Option 3: TAnew = 2*TAold - t, where t is the relative timing difference between the new and old cells.
Option 4: TAnew = TAold, with no adjustment for the relative timing difference.
Explanation: The correct calculation for the new Timing Advance (TAnew) during a handover in a TDD system involves adjusting the old timing advance (TAold) by twice the relative timing difference (t) between the new and old cells, ensuring the UE's uplink transmission is synchronized with the target cell's timing.