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What is the Basic Principle of Random Access in LTE?

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posted Jul 9, 2013 by anonymous

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1 Answer

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Random access is the procedure of uplink synchronization between UE and E-UTRAN. Prior to random access, physical layer shall receive the following information from the higher layers:
Random access channel parameters: PRACH configuration, frequency position and preamble format, etc.
Parameters for determining the preamble root sequences and their cyclic shifts in the sequence set for the cell, in order to demodulate the random access preamble.

answer Jul 10, 2013 by anonymous
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+1 vote

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If my understanding is correct then as part of handover procedure, UE can do either contention based rach or non-contention based.
Now my question is that on what parameter basis target eNodeB decide for an UE to do contention/non-contention based rach during the handover procedure ?

+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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