Optimize RACH failures

RAN
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1

Hi dears, Speaking of which Scg failures
Can any one please suggest about Rach failures?
And best way to optimize or the recommended parameters to adjust?

2

Check for msg3 harq parameter, power ramp value, path loss.
You need to check where RACH getting failed, is it msg 3 or msg2.

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3

What are the reasons for RACH failure?
When UE tries 200 times for RACH and in what case it tries for 6 time only?
Please any suggestion?

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4

So far what Maine reasons I found for RACH

Week and deep indoor coverage issues(high rise thick wall buildings)
Specific UE create issues (can check if RACH degradation happens in any specific time)
Cell range issue or msg 1 start frequency
RSI collisions
Overshooting issues

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5

RACH is Physical and MAC layer procedure but the RACH configuration is provided through RRC layer from the GNB/ENB

  1. Incorrect PrachConfigCommon (SSBperRACH ocassionmapping)
    a. During Handover
    b. During NSA addition
    c. During SIB1 initial registration

  2. Preamble max transmission

  3. Msg2 reception failed

  4. Random access preamble Iā€™d mismatch

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