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What is the purpose of timing advance IE in Random access response message?

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What is the purpose of timing advance IE in Random access response message?
posted Dec 18, 2014 by Gnanendra Reddy

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1 Answer

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UE uses TA value to adjust the transmission of msg3. UE precedes msg3 transmission to compensate the path delay so that msg3 should be received at eNodeB in correct time frame.

answer Dec 21, 2014 by Veer Pal Singh Yadav
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+3 votes

As i know about RACH function is, suppose a UE wants to access the network, so first it will try to attach or syncronise with the network. In LTE a separate channel PRACH ( Physical Random Access Channel) is provided for initial access to the network.

The functionality is clear to me that is not a problem but to understand those two procedures i am having a trouble...

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What is size and content of RACH first message (Random Access Preamble transmission) by UE to eNodeB.
Also if someone can explain the fields and sizes?

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