Question: In 1.28 Mcps TDD option for Base Station (BS) conformance testing, when measuring PCCPCH code domain power using the global in-channel Tx test method, what happens to the relative powers of the PCCPCH and DPCHs during output power reduction?
Option 1: The relative powers of the PCCPCH and DPCHs are adjusted proportionally with each output power reduction step.
Option 2: The relative powers of the PCCPCH and DPCHs remain unchanged throughout all output power reduction steps.
Option 3: The PCCPCH power is reduced more significantly than the DPCHs' power in each step to prioritize voice channels.
Option 4: The DPCHs' power is increased slightly with each reduction step to maintain signal quality.
Explanation: According to the test procedure for BS conformance testing in the context of 1.28 Mcps TDD option, when reducing the base station output power by specific increments (2 dB, 5 dB, and 13 dB), it is stipulated that the relative powers of the Primary Common Control Physical Channel (PCCPCH) and the Dedicated Physical Channels (DPCHs) should not be altered. This ensures that the test accurately reflects the channel's performance characteristics under varying power conditions without introducing variables that could skew the results, thus maintaining the integrity of the conformance testing process.