Dynamic Dispatching

Dynamic dispatching is the state-aware scheduling approach that changes lot-priority decisions in real time based on current fab conditions - it outperforms fixed rules when variability and constraints shift throughout the day.

What Is Dynamic dispatching?

• Definition: Dispatch logic that adapts policy by queue status, tool health, due-date pressure, and risk constraints.
• Decision Mode: Can switch heuristics or reweight scoring criteria as operating context changes.
• Data Dependency: Requires accurate, low-latency visibility into MES, AMHS, and tool states.
• Implementation Forms: Rule engines, simulation-guided policies, or optimization-based controllers.

Why Dynamic dispatching Matters

• Context Fit: Static rules rarely remain optimal across all congestion and priority regimes.
• Cycle-Time Control: Adaptive prioritization can reduce both average and tail delays.
• Risk Response: Improves handling of hot lots, queue-time windows, and bottleneck disruptions.
• Utilization Protection: Better responds to sudden tool outages and recovery events.
• Delivery Performance: Dynamic choices improve due-date adherence under volatile conditions.

How It Is Used in Practice

• State Modeling: Define operating regimes and associated dispatch responses.
• Rule Orchestration: Combine baseline policy with automated overrides for critical events.
• Continuous Validation: Evaluate dynamic policy impact with online KPIs and periodic simulation replay.

Dynamic dispatching is an advanced scheduling capability for complex fabs - real-time policy adaptation improves flow robustness, priority execution, and overall operational performance.