MSC CSFB Indication Handling for LTE Return Accuracy

The patent applies local quality by differentiating the treatment of different UE groups. Instead of uniformly redirecting all UEs, the system identifies UEs that need to return to LTE network through specific criteria (such as UE location, service type, and network conditions) and applies redirect logic only to those specific UEs. This selective approach resolves the contradiction by maintaining network management flexibility while avoiding mistaken redirects.

The patent implements feedback mechanisms where the MSC receives information from the MME about UE status and service requirements. This feedback loop allows the MSC to make informed decisions about which UEs should return to LTE network and which should remain on CS network, thereby improving return accuracy without sacrificing management flexibility.

The patent extracts the CSFB indication tracking function from the general MSC processing logic and integrates it into the existing MME-MSC interface protocols. By leveraging existing message structures and protocols, the system achieves precise CSFB status detection without proportionally increasing processing complexity. The extraction allows focused implementation of tracking functionality while maintaining overall system simplicity.

The patent makes existing MSC components multi-functional by enabling them to handle both traditional CSFB redirection and the new comprehensive tracking requirements. The same MSC entities that process basic CSFB indications also handle the enhanced tracking and selective redirect functions, thereby achieving high measurement precision without linearly increasing system complexity.