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UE needs to read which MIB/SIB in idle mode when return from no coverage area?

+4 votes
UE needs to read which MIB/SIB in idle mode when return from no coverage area?
posted Feb 16, 2015 by Veer Pal Singh Yadav

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1 Answer

+1 vote

UE need not to read MIB/SIB Because UE will check if any stored plmns available if it is there it goes for cell reselection procedure here UE need Sib3 Information

answer Feb 17, 2015 by Gnanendra Reddy
Will ue used the stored SIB3 infor? then how UE will get to know the stored SIB3 is updated SIB3? It may be be possible that during no coverage area SIB has modified.
In my opinion, after coming back to coverage, UE will use stored plmn to do reselection if this fails then it will read MIB/SIB and then do reselection.

System information change is indicated in sysinfo value tag if this is set to 1 in SIB1 then UE will know that SI is updated or there is new SI
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+3 votes

As Far As I know, When UE is in IDLE mode,
1) EnodeB will remove the context of UE but MME will not.. right?
2) When UE is in idle state will MME have the TEID(s1ap,s1u)? If yes then during Pagging ans Service Request will MME use the same TEID?
3) If MME removes the TEID then during Pagging how will MME selects EnodeB?
4)If EnodeB has removed all context then how EnodeB will send pagging message to UE?
5)If EnodeB has removed the context then how UE Measurment (RSRP,RSSI,RSRQ) done?
6)If UE is idle for few days then MME will remove the context of UE? if not then what about the Purge UE Request (PUR) message between MME-HSS. (As far as i know MME will send PUR when UE is idle state for few days)