In UMTS the S-RNTI is the UE (User Equipment) identifier which is allocated by the Serving RNC (Radio Network Controller) and is unique within that SRNC. It is allocated to all UE having a RRC (Radio Resource Control) connection. S-RNTI is reallocated when the Serving RNC for the RRC connection is changed and de-allocated when the RRC connection is released.
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