Subband SNR Correction in Frequency Selective Scheduling

The system implements a feedback mechanism where the scheduler monitors the freshness of subband CQI reports and uses wideband CQI reports as feedback when subband reports are stale. The scheduler determines report freshness based on timing information and adjusts scheduling decisions accordingly, creating a closed-loop system that maintains reliability while utilizing precise subband measurements when available.

The wideband CQI report acts as an intermediary mechanism that bridges the gap between stale subband reports and current channel conditions. When subband CQI reports are outdated, the scheduler uses wideband CQI reports as a proxy to maintain scheduling decisions, effectively mediating between the need for precise subband measurements and the requirement for reliable, up-to-date information.

The system dynamically adjusts the CQI reporting strategy based on the freshness of available subband reports. The scheduler determines whether to request new subband CQI reports or rely on existing wideband reports, creating a dynamic reporting mechanism that adapts to current conditions rather than following a fixed schedule, thereby reducing overhead while maintaining precision when needed.

Instead of requiring complete subband CQI reports at every sub-frame, the system uses partial action by relying on wideband CQI reports when subband reports are stale. This partial approach maintains sufficient scheduling accuracy without the excessive overhead of continuous subband reporting, achieving a balance between measurement precision and reporting complexity.