Question: In UTRAN Iur interface RNSAP signalling, how is Measured Rx Timing Deviation used as a basis for timing advance when considering both RACH bursts and USCH measurements?
Option 1: By subtracting the current Timing Advance value from the Rx Timing Deviation measurement on the USCH and then combining it with direct measurements from RACH bursts.
Option 2: By either measuring directly from a RACH burst or by calculating from the Rx Timing Deviation on the USCH with an addition of the current Timing Advance value.
Option 3: Through a weighted average of Rx Timing Deviation measurements from both RACH bursts and USCH, without considering the current Timing Advance.
Option 4: Exclusively from direct measurements of RACH bursts, ignoring Rx Timing Deviation on the USCH for timing advance calculations.
Explanation: This is correct because Measured Rx Timing Deviation serves as a basis for timing advance in two ways: (1) through direct measurement from a RACH burst, or (2) by calculating it from the USCH Rx Timing Deviation and adding the current Timing Advance value, ensuring flexibility and accuracy in adjusting for timing deviations in UTRAN networks.