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LTE: When an eNodeB reponds with RRC Connection Reject containing the "deprioritisationReq" information for a request ?

+1 vote

I saw RRC Connection Reject message in specification. There is an IE "deprioritisationReq" within the RRCConnectionReject message. I want to know when eNodeB includes this IE while rejecting a rrc connection request for an UE.

posted Aug 28, 2016 by Harshita

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1 Answer

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Hi Harshita,
In case UE receives RRCConnectionReject with deprioritisationReq, UE shall consider current carrier frequency and stored frequencies due to the previously received RRCConnectionReject with deprioritisationReq or all the frequencies of EUTRA to be the lowest priority frequency (i.e. lower than the eight network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS

Message(From RRC spec):---
RRCConnectionReject-v1130-IEs ::= SEQUENCE {
deprioritisationReq-r11 SEQUENCE {
deprioritisationType-r11 ENUMERATED {frequency, e-utra},
deprioritisationTimer-r11 ENUMERATED {min5, min10, min15, min30}
} OPTIONAL, -- Need ON
nonCriticalExtension RRCConnectionReject-v1320-IEs OPTIONAL

For more please refer 36.304 cause Reselection priorities handling

answer Sep 3, 2016 by Sivakumar.d
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+2 votes

It may be an easy question but still I have some doubt.
How RRC Connection setup procedure gets impacted with the presence of "S-TMSI" as an UE-Identity within the RRC Connection Request message ?
Note: RRC Connection request message can carry either 5 bytes long (S-TMSI) or 5 bytes long random value.

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