Question: In a TDD (Time Division Duplexing) system, as per 3GPP specifications, when testing the power control dynamic range of a Base Station (BS), what is the primary purpose of transmitting "Increase Tx power" and "Decrease Tx power" TPC (Transmit Power Control) commands in separate sequences?
Option 1: To synchronize the BS transmitter with the tester's receiver.
Option 2: To measure the propagation delay between the BS and the tester.
Option 3: To facilitate the measurement of the maximum and minimum code domain power of the active DPCH (Dedicated Physical Channel), thereby determining the power control dynamic range.
Option 4: To test the BS's ability to handle concurrent TPC commands from multiple UEs (User Equipment).
Explanation: The correct answer, Option 3, highlights the main objective of sending sequential TPC commands to adjust the transmission power. By increasing and then decreasing the Tx power to its maximum and minimum limits, respectively, the test measures the range within which the BS can dynamically control its power output for an active DPCH. This process is crucial for evaluating the BS's power control capabilities, ensuring it can effectively manage signal strength to maintain quality and minimize interference in a TDD system.