LTE: What does the use of "selectedPLMN-Identity" IE in RRC ConnectionSetupComplete message ?

Question

RRC Connection Request message carries "Initial UE identity" which is just 5 bytes long identifier. Why does so many information elements send within the "Re-establish UE-Identity" like C-RNTI, physcellId etc ?

Answer 1

selectedPLMN-Identity: This IE points to a PLMN-Id in the plmn-IdentityList of SIB1 (System Information Block).

The *plmn-IdentityList* IE is transmitted in SIB1 when the cell belong to more than one PLMN.The value of this IE equals to ‘1’ if the 1st PLMN is selected from the plmn-IdentityList included in SIB1, ‘2’ if the 2nd PLMN is selected from the *plmn-IdentityList* included in SIB1 and so on.

Comments

Thanks Bart Barton to provide the your answer. But I have asked, what is the significance of presence of this IE in RRC Connection Setup Complete message ? And What eNodeB does with this received IE ?

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Have no idea what your question is about then, because this is the meaning of this IE in Conn Setup Complete msg.

Maybe this will tell you more
http://www.3gpp.org/ftp/specs/archive/36_series/36.331/

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If a cell is shared by multiple PLMN operators,Inorder to identity the UE is belongs to which PLMN operator & billing is done based on the PLMN ID.
If UE not shared selected PLMN id,then eNB having confusion for which PLMN the UE belongs to.so to avoid those issues UE selects& shares the selected PLMNId...