Question: Which of the following services is NOT expected by the Medium Access Control (MAC) sublayer from the physical layer, according to standard telecom protocol specifications?
Option 1: Data Transfer Services
Option 2: Mobility Management Decisions
Option 3: Signalling of HARQ Feedback
Option 4: Measurements (e.g., Channel Quality Indication - CQI)
Explanation: The MAC sublayer relies on the physical layer for specific, well-defined services. Among the provided options, 'Mobility Management Decisions' is not a service expected from the physical layer by the MAC sublayer. Instead, it's more related to higher-layer functionalities (e.g., RRC layer in LTE/5G systems) that manage handovers and cell reselections based on measurements (like CQI) provided by the physical layer, but the decision itself is not a service offered by the physical layer to the MAC. The other options are all services that the MAC sublayer expects from the physical layer for efficient operation.