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After TA command from ENB How UE applies?

+2 votes
53 views

receive TA command as 1 in RAR, does this means UE should send data one SF before? But i am not seeing this behavior in LTE logs, UE is sending data in same subframe.

posted Aug 13 by Akhilesh

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1 Answer

0 votes

The Timing Advance Command in RAR takes 11 bits and it can indicate an index value TA (0, 1, 2… 1282) which used to control the amount of timing adjustment that UE has to apply. The amount of the time alignment is given by NTA = TA × 16. The Timing Advance obtained via RAR is always positive

If TA = 1 ⇨ Timing Adjustment = NTA = 16 Ts = 16/30720000 sec = 0.5208 μs

So ue will start UL transmission is same subframe with .5208 μs before so that it should reach at enb in same subframe boundaries.

answer Aug 15 by Veer Pal Singh Yadav
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+1 vote

If UE is configured with Dual connectivity i.e LTE + NR, Then UE has two option to apply UL power which Pmax of LTE and Pmax of NR. How does UE select which max power to apply for both the cell.

0 votes

UE used NDI bit to decide the transmission is new or re transmission .When UE ignores this bit and continue.

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