Question: In UTRAN TDD, for which of the following UE states can the inter-RAT cell change order procedure to GSM be utilized, alongside another state?
Option 1: IDLE and CELL_PCH
Option 2: _ and DCH (Dedicated Channel) FACH (Forward Access Channel)
Option 3: URA_PCH (UTRAN Registration Area Paging Channel) and CELL_FACH
Option 4: CELL_DCH (Cell Dedicated Channel) and IDLE
Explanation: The correct answer is Option 2 because the question hints at two specific states where the inter-RAT cell change order from UTRAN TDD to GSM can be used. Given the context, one of these states is clearly FACH (Forward Access Channel). The other state, though partially obscured in the provided snippet (_), typically would complement FACH in such procedural contexts within UTRAN, often implying a state like DCH (Dedicated Channel) for continuous connectivity before switching. Thus, understanding typical UTRAN states and their roles in handovers/procedure initiations leads to selecting _ and DCH FACH as the most fitting answer, acknowledging the partial redaction.