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How UE distinguished from SIB modification paging to which SIB modified?

+1 vote
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UE Receives SIB modification through paging message. But how UE will get to know which SIB is modified?

posted Jun 20, 2019 by Sakshi Rai

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2 Answers

0 votes

Hi,
UE don't get any notification of which MIB/SIB is being modified, UE will be in DRX connected mode, UE wakes up and read the downlink shared channel(PBCH and PDSCH). But will be unaware of which MIB/SIB are modified

answer Jun 20, 2019 by Sushant Bose
After receiving paging, then How UE will acquire SIB, UE should know which SIB is modified right?
0 votes

Example : SIB-3 is modified at the eNB

  1. paging message will be broadcasted to all the UEs
  2. UEs will receive PRNTI (0XFFFE) in PDCCH channel when it wakes up at idle mode or connected mode DRX
  3. Paging message will be received at PDSCH channel
  4. RRC will (ASN) decode the PCCH/paging message being received (PHY->L2->RRC)
  5. If the IE systemInfoModification is set to true in the paging message, then RRC will send SI acquisition request to PHY
  6. PHY will acquire SIB-1 and then RRC decodes SIB-1; periodicity and windowLength of SIB-3 will be obtained.
  7. RRC will send these informations to PHY; the PHY will acquire SIB-3 and forwards to RRC.
  8. RRC will (ASN) decode modified SIB-3
answer Dec 9, 2020 by Manje Gowda K.r.
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