Question: In a TDD-GSM cell re-selection scenario for a UE (User Equipment) supporting both TDD and GSM, what is the primary factor influencing the interruption time (Tinterrupt,GSM), aside from the fixed 40ms?
Option 1: The number of re-transmissions required during the handover process.
Option 2: The maximum time allowed to read BCCH (Broadcast Control Channel) data from the GSM cell (TBCCH).
Option 3: The propagation delay between the UE and the GSM cell tower.
Option 4: The type of service (voice/data) being used by the UE at the time of re-selection.
Explanation: During a TDD-GSM cell re-selection, the interruption time (Tinterrupt,GSM) is crucial for maintaining seamless connectivity. While factors like propagation delay and re-transmissions can generally affect network performance, the specific formula provided (Tinterrupt,GSM = 40 + TBCCH + ms) highlights that the primary variable component influencing this interruption time, aside from the constant 40ms, is indeed the maximum time required to read BCCH data from the GSM cell (TBCCH). This is because reading BCCH data is a necessary step for the UE to gather essential system information about the target GSM cell, directly impacting the handover duration.