Color-Aware Upstream Switch Transmission Rate Control

The patent segments the single congestion control mechanism into multiple differentiated pause messages. Instead of applying uniform backpressure to all traffic, the system generates selective pause messages targeted at specific upstream nodes and traffic flows causing congestion, while allowing other flows to continue uninterrupted. This segmentation resolves the contradiction by maintaining reliability through targeted congestion control while preserving fairness through selective application.

The patent implements local quality by applying different congestion control actions to different traffic flows based on their specific characteristics and contribution to congestion. Each upstream node receives customized pause messages reflecting its actual traffic behavior and buffer occupancy impact, rather than applying a uniform pause to all traffic. This local differentiation maintains reliability while ensuring fairness among diverse traffic aggregates.

The patent applies universality by using a single shared buffer pool that serves multiple MAC destinations and traffic flows simultaneously. Instead of allocating dedicated buffers for each destination, the system manages a universal buffer resource that can be dynamically allocated to any flow experiencing congestion. This approach maintains precise congestion control for individual flows while preserving buffer scalability and reducing overall memory requirements.

The patent merges multiple destination-specific buffer requirements into a single unified buffer structure. By combining buffer resources and managing them centrally with flow-aware control logic, the system achieves precise congestion control for individual MAC destinations without requiring separate buffer allocations. This merging reduces device complexity and improves scalability while maintaining the precision of selective backpressure.

The patent merges previously isolated destination-specific buffers into a unified shared buffer pool. This consolidation allows buffer space to be dynamically shared among multiple traffic flows based on actual congestion needs. When one destination's buffer is underutilized, other flows can utilize the available capacity, eliminating resource wastage while maintaining effective congestion control through flow-aware pause message generation.

The patent introduces dynamic buffer allocation where buffer capacity is not statically assigned to specific MAC destinations but is dynamically available to any flow requiring congestion control. The system adaptively manages buffer occupancy across different flows, allowing resource reallocation based on real-time traffic conditions. This dynamic approach improves resource utilization efficiency while preserving congestion control effectiveness through selective pause messaging.

The patent segments the congestion control application to target only the specific upstream nodes and traffic flows responsible for buffer occupancy exceeding thresholds. Instead of pausing all traffic aggregates, the system generates selective pause messages directed at the offending flows while allowing well-behaved sessions to continue at full rate. This segmented approach relieves congestion effectively while preserving network efficiency by avoiding unnecessary penalties to aggressive sessions.

The patent implements feedback-based selective congestion control where downstream nodes monitor buffer occupancy and generate pause messages only when specific traffic flows cause congestion. The feedback mechanism identifies and targets only the aggressive sessions contributing to buffer overflow, allowing non-aggressive sessions to proceed without penalty. This selective feedback approach maintains congestion relief while preserving overall network efficiency and productivity.