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LTE: How much time a LTE UE takes to complete frequency synchronization ?

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What steps are considered to calculate frequency synchronization time ?

posted Sep 20, 2016 by Neelam

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1 Answer

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Hi,

Once UE founds the central carrier, IT will take MAX of 10ms to get time and freq synch. Because to get synch UE has to decode PSS and SSS, so within 10ms UE will listen both and gets the synch.

answer Sep 20, 2016 by Jaganathan
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How an UE makes out it has lost uplink synchronization with serving cell and what steps it take to re-synchronize it ?

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If PSS is read first then why SSS comes first in time domain?

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There are couple of procedures are defined which consist of NAS as well as RRC signalling messages exchange.
Some of the NAS message sends to an UE through RRC Connection Reconfiguration message as piggybacked and some as DL Info transfer.

I want to know, Is there any procedure exists in lte when an UE receives RRC Connection Reconfiguration along with NAS message and responds back to network with NAS message first and then Reconfiguration Complete to eNodeB.

Usually, I saw UE sends RRC Connection Reconfiguration Complete message first then NAS response message.

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