Section: 6.8.11 Handling of the START value in intersystem mobility cases
Content: The START values (see clause 6.4.8) shall be kept in the volatile memory of the ME in the following cases: - Intersystem idle mobility for CS Services – from UTRAN to GSM BSS; - Intersystem handover for CS Services – from UTRAN to GSM BSS; - Intersystem change for PS Services – from UTRAN to GSM BSS; - PS handover from Iu to Gb mode; - SRVCC – from HSPA to UTRAN/GERAN; NOTE: The handling of mobility from UTRAN to E-UTRAN is described in TS 33.401[ 3GPP System Architecture Evolution (SAE); Security architecture ]  [28]. Hence, also the corresponding handling of START is described there.