Question: In a TDD (Time Division Duplex) radio resource management test for SFN-SFN (System Frame Number) observed time difference type 2 measurement accuracy, what is the specified timing relationship between Cell 1 and Cell 2?
Option 1: Cell 1 leads Cell 2 by a fixed 216 chip duration.
Option 2: Cell 1 and Cell 2 have independent frame timings.
Option 3: The timing difference between Cell 1 and Cell 2 is randomly varied within each test iteration.
Option 4: Cell 1 and Cell 2 are synchronized, sharing the same frame timing, with a configurable timing difference up to 432 chips.
Explanation: In the context of testing SFN-SFN observed time difference type 2 measurement accuracy in TDD systems, ensuring both cells operate from the same frame timing reference is crucial for meaningful measurements. The ability to configure a timing difference (up to 432 chips) between the two synchronized cells allows for comprehensive testing across various scenarios, reflecting real-world deployment variations where base stations might not perfectly align in time due to synchronization offsets or intentional delays for interference management. This setup enables verification of the system’s performance under specified limits, as required by section 9.1.1.8 of the relevant standard.