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Which type of rach procedure should perform in rrc re-establishmemt?

+1 vote
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Which type of rach procedure should perform in rrc re-establishmemt?
posted Sep 19, 2016 by Suchakravarthi Sripathi

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Hi,

what do you mean by RACH type ???
Contention or contention free??  And what is the reason

1 Answer

+1 vote

Hi,

It is always contention based RACH, because Whil re-establishing there will be no connection between ENB and UE. So ENB cant give the contention free preambles to UE.

answer Sep 19, 2016 by Jaganathan
Hi,

In this case PDCCH order can be possible?
No, ENB cant inform contention free preamble to UE.
can you please verify this link and let me know what mentioned in this ...

http://lteinwireless.blogspot.in/2012/04/rrc-connection-re-establishment-in-lte.html

under "Query_4" section have some tip note "Important TIP:"

please verify and let me know
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Upon detecting Radio Link Failure UE will do RRC Connection re-establishment but to do RRC Connection re-establishment security should be activated in UE, otherwise UE will go Idle mode.So here(After detecting RLF) we are resetting all PHY,MAC,RLC,PDCP Configurations but why we are making security should be there to do RRC Connection re-establishment.

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Regards,
Suchakravarthi

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