Service-Aware Overload Handling in Communication Networks

The patent segments the throttling mechanism from the generic SIP method level to the specific service level. Instead of applying a single throttling window to all services using the same SIP method, the system creates separate throttling windows for each service (e.g., MMTel service, RCS group chat service). This allows independent overload control for each service, preventing the rejection of requests for non-overloaded services while still protecting overloaded ones.

The patent implements local quality by making the throttling behavior service-specific rather than uniform across all services. Each service receives customized throttling treatment based on its own overload status. The proxy node determines overload conditions individually for each service and applies appropriate throttling only where needed, rather than applying a blanket throttling mechanism to all services using the same SIP method.

The patent achieves universality by making the proxy node multi-functional. The same proxy node that performs generic SIP message routing also performs service-specific overload detection and throttling control. By integrating multiple functions (SIP routing, service identification, overload detection, and service-specific throttling) into a single node, the system avoids the need for separate complex systems while still achieving fine-grained service-level control.

The system implements self-service by enabling the proxy node to autonomously determine service-specific overload conditions and apply appropriate throttling without external intervention. The proxy node itself performs the overload detection for each service and makes decisions about request forwarding or rejection based on service-specific thresholds, eliminating the need for external centralized control mechanisms.