Question: In a UTRAN with downlink power control, if a Block Error Rate (BLER) target is assigned to a Dedicated Control Channel (DCCH), what should be ensured regarding its setting in relation to the Dedicated Traffic Channel (DTCH)?
Option 1: The BLER target for DCCH should be set higher than that for DTCH to prioritize control signals.
Option 2: The BLER target for DCCH should be set low enough not to dominate the one for DTCH, ensuring outer loop power control is based on DTCH.
Option 3: The BLER targets for both DCCH and DTCH should always be identical for balanced performance.
Option 4: The setting of the BLER target for DCCH does not affect the outer loop power control based on DTCH.
Explanation: Correct downlink power control in a UTRAN requires that if a BLER target is assigned to a DCCH, it must be set at a level that does not override the target for the DTCH. This ensures outer loop power control is effectively based on the DTCH rather than the DCCH. Setting the DCCH BLER target too high could increase downlink power, compromising efficiency and potentially affecting network performance. Option 2 correctly reflects this requirement, emphasizing the need for the DCCH's BLER target to be sufficiently low to avoid dominating the DTCH's target.