SMSF Registration Messaging During 4G-5G Handover
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Solution Overview
Problem
The frequent handovers between 4G and 5G networks result in increased signaling among core network nodes and instances where user equipment registers with and authenticates to the network, leading to inefficiencies and performance issues.
Innovation Solution
Implementing techniques that suppress deregistration and unsubscribe messages between the SMSF and UDM during handovers, allowing SMSF session information to be retained in the UDR, and optimizing messaging by the HSS to determine the correct network for SMS delivery based on retained registration status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequent handovers between 4G and 5G networks are allowed to maintain network flexibility and coverage, then network adaptability and service continuity are improved, but signaling overhead and network node messaging increase
Solution Approach 1:
The patent extracts and suppresses redundant deregistration and unsubscribe messages during handover procedures. When a UE hands over between 4G and 5G networks, the system selectively removes unnecessary notification messages between SMSF and UDM nodes, keeping only essential signaling while discarding duplicate registrations and deregistrations that do not contribute to actual service delivery.
Solution Approach 2:
The system discards redundant registration and deregistration messages that are generated during frequent handovers, while recovering and retaining essential SMSF session information in the UDR. This allows the network to eliminate signaling overhead from repeated handovers while preserving necessary user data for future service restoration.
2Measurement precision
If deregistration messages are sent during each handover to maintain accurate network registration status, then registration accuracy is improved, but messaging frequency and network load increase
Solution Approach 1:
The patent applies partial action by sending deregistration messages selectively rather than for every handover event. The system determines when actual deregistration is necessary versus when the UE is merely moving between networks, suppressing messages during routine handovers while maintaining accurate registration status when truly needed.
Solution Approach 2:
The system maintains copies of SMSF session information in the UDR that persist across handovers. Instead of relying on continuous deregistration/registration messaging to track UE status, the network preserves session data copies that can be recovered when needed, reducing the need for frequent messaging while maintaining registration accuracy.
3Stability of the object's composition
If SMSF session information is cleared during handover to maintain data consistency, then data accuracy is improved, but service continuity and response time deteriorate
Solution Approach 1:
The patent performs preliminary actions by retaining SMSF session information in the UDR before handover occurs. The system proactively preserves session data and flags it for potential recovery, so when the UE returns to 5G network, the information is already available and can be quickly restored without requiring time-consuming re-registration and data retrieval procedures.
Solution Approach 2:
The UDR acts as an intermediary that stores and preserves SMSF session information during handovers. This intermediate storage mechanism decouples the SMSF from direct dependency on continuous UE registration status, allowing session data to survive handovers intact and be recovered when the UE returns, thus maintaining both data consistency and service continuity.
Data Source
AI summary
Techniques for optimizing messages in a telecommunications network are discussed herein. More particularly, an SMSF can be configured to refrain from sending deregistration and/or unsubscribe messages to a UDM in response to a handover from 5G to 4G, which can thereby reduce signaling in the network. Further, because of the suppressed messages, the network maintains SMSF session information, which indicates the delivery location for a SMS message. However, when a SMSC receives a SMS addressed to the UE, the HSS may query a UDR for SMSF session information, SMSF registration status, and/or AMF registration status. The HSS may determine a location for the SMS based on the active location of the UE, as determined by the AMF registration status. Thus, the techniques discussed herein represent network optimizations while allowing SMS messages to be correctly routed in a network.