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When to use DCI 3/3A: Even though we have DCI 0/1/2 to send TPC why do we need separate DCI 3/3A format for TPC?

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When to use DCI 3/3A: Even though we have DCI 0/1/2 to send TPC why do we need separate DCI 3/3A format for TPC?
posted Mar 21, 2017 by Karan Patel

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when you don't have to give UL grant then ENB cannot use DCI0 formats then in that scenario it has to use DCI 3./3A to give TPC

answer Mar 22, 2017 by Rohit Verma
If UE don't have UL data then why it need TPC .
commented Mar 22, 2017 by Karan Patel
Suppose IF UE is configured with CQI and SRS then there is no need of giving explicit UL grant ,then in this case UE need TPC to adjust.
commented Mar 22, 2017 by Rohit Verma
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why SRB2 is implemented though ue have SRB 0,1 in LTE ?

we know
SRB0 is for rrc message on ccch ,
SRB1 rrc +nas messages on DCCH and SRB 1 has higher priority than SRB2
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when SRB 2 is used ?
which type of messages v can expect in SRB2 ?

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