Timing advance in GSM :- For GSM A Timing Advance (TA) is used to compensate for the propagation delay as the signal travels between the Mobile Station (MS) and Base Transceiver Station (BTS). The BASIC Behind TA ( Timing Advance ) is as per Below. An 11 bit value (range 0,1.1282) is signaled to establish the initial offset.
Otherwise the RACH-procedure establishes a valid timing advance. If UE is in-sync the timing advance is valid. = 1 / (2048 x 15000) sec = 1 / 30720000 sec the granularity is given by 0.52 μsec (corresponding to 78 m means lte timing advance 78m) Lte timing advance distance calculation:- As Ts. The time advance is initiated by E-UTRAN with a MAC message, which implies a time-out setting. Now, the eNB sends a random access response consisting of a timing advance command based on the UE setting the transmission time of the terminal. If the UE wishes to establish an RRC connection with the eNB, it sends a random access preamble, and the eNB estimates the transmission time of the terminal on that basis.
The value range for adjustment is 8 bit and related to the current UL timing for time advance. It is signaled by means of a special MAC control element LCID = 11101. It commands the UE to adjust the transmission time. What is timing advance in lte: -The eNB measures the required timing advance based on the received UE signal arrival time.
