Radio network Terminal Identity
C-RNTI -> Unique at cell level
Assign by SRNC
Size is 16 bit
*This is used by FACH
S-RNTI -> Uniquely identifies a UE in SRNS
Assigned by SRNC while RRC-Connection Establisment
This is discarded if RRC Connection is released or when SRNC changes
This is 19 bits where 0 to 9 bits is S-RNTI
U-RNTI -> Uniquely identified in UTRAN because S-RNC id is included
Assigned when RRCConnection Establishment
URNTI = SRNC-ID + S-RNTI
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