Question: In a scenario where a UE's (User Equipment) output power is insufficient to support the currently used TFC (Transport Format Combination), what action should the UE take according to 3GPP specifications for packet data services like Interactive or Background, PS (Packet Switched) with a UL (Uplink) rate of 64kbps?
Option 1: The UE blocks (stops using) the current TFC and selects an alternative TFC that matches its available output power.
Option 2: The UE continues to use the current TFC but reduces the packet size to accommodate the lower output power.
Option 3: The UE switches from Packet Switched (PS) to Circuit Switched (CS) to maintain the connection with reduced power.
Option 4: The UE increases its output power to support the current TFC, even if it exceeds the recommended safety limits.
Explanation: According to 3GPP specifications for radio transmission and reception, when a UE's output power is not sufficient to support the currently used TFC for packet data services (like Interactive or Background with specific uplink rates), the UE should block (stop using) that TFC. This ensures efficient use of resources and prevents transmission failures due to insufficient power. The correct action involves selecting an alternative TFC that aligns with the UE's available output power, ensuring continued service quality within the device's operational capabilities.