Question: What is the primary condition for cell re-selection delay in a UE (User Equipment) transitioning to Cell 1, as per radio resource management requirements?
Option 1: The UE must complete the transition within the time it takes to send three consecutive preambles on the PRACH.
Option 2: The rate of correct cell reselections must be at least 95% during repeated tests.
Option 3: The UE's RRC CONNECTION REQUEST message must be successfully received by Cell 1 before initiating any data transfer.
Option 4: The cell re-selection delay, from the start of time period T2 to camping on Cell 1 and sending preambles for an RRC CONNECTION REQUEST, must be less than 2 seconds.
Explanation: This option correctly captures the key requirement for cell re-selection delay as specified in the context of radio resource management. The focus is on the time constraint (less than 2 seconds) from the beginning of T2 to when the UE camps on Cell 1 and initiates the connection request process, highlighting a crucial aspect of efficient network handover and resource allocation.