name: RAC
full_form: Routing Area Code
context: Fn rises above the threshold indicated by the Predicted SFN-SFN Deviation Limit IE. The Pn and Fn are calculated according to the following: Pn=b for n=0 [FDD - Pn = ((a/16) * ((SFNn â SFNn-1) mod 4096)/100 + Pn-1 ) mod 614400 for n>0] [FDD - Fn = min((Mn - Pn) mod 614400, (Pn - Mn) mod 614400) for n>0] [TDD - Pn = ((a/16) * (15*(SFNn â SFNn-1)mod 4096 + (TSn â TSn-1))/1500 + Pn-1 ) mod 40960 for n>0] [TDD - Fn = min((Mn - Pn) mod 40960, (Pn - Mn) mod 40960) for n>0] Pn is the predicted SFN-SFN value when n measurement results have been received after the first Common Measurement Reporting at initiation or after the last event was triggered. a is the last reported SFN-SFN Drift Rate value. b is the last reported SFN-SFN value. abs denotes the absolute value. Fn is the deviation of the last measurement result from the predicted SFN-SFN value (Pn ) when n measurements have been received after the first Common Measurement Reporting at initiation or after the last event was triggered. Mn
description: The Routing Area Code (RAC) is an identifier used in the UTRAN to identify a specific routing area within the network. It is included in the DIRECT TRANSFER message sent from the RNC to the CN, along with the LAI (Location Area Identifier), to facilitate routing of UE-CN signalling messages in the PS domain.
explanation: The context explicitly states that RAC is used as an identifier for a specific routing area within the UTRAN network. Its role is to facilitate message routing between the RNC and CN.
section_title: 8.23.2.2	UTRAN Originated Direct Transfer
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