Network Node Subscriptions for Cross-Domain Service Continuity
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Solution Overview
Problem
Existing telecommunications networks face challenges in maintaining seamless service continuity when user equipment (UE) transitions from one domain, such as 4G, to another, like 5G, leading to service interruptions due to incomplete subscription management across different domains.
Innovation Solution
A method involving nodes in the network, such as SCEF-NEF, subscribes to receive notifications when a UE is upgraded to access a new domain, enabling seamless event monitoring across domains by requesting and receiving indications about new accessibility, allowing continuous event monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a device transitions from one domain to another domain in a telecommunications network, then the device can access new services and capabilities in the second domain, but service continuity is interrupted and event monitoring is lost due to incomplete subscription management across domains
Solution Approach 1:
The first node sends a subscription request to the second node before the device actually transitions to the second domain. This preliminary subscription ensures that when the device does transition, the event monitoring is already in place and service continuity is maintained without interruption
Solution Approach 2:
The first node acts as an intermediary between the device and the second node. It manages the subscription on behalf of the device, coordinating between the device's current domain and the target domain to ensure seamless event monitoring across domain boundaries
2Reliability
If subscription management is maintained separately for each domain, then domain-specific service optimization is achieved, but event monitoring is lost during domain transitions leading to service interruptions
Solution Approach 1:
The first node implements a universal subscription management mechanism that works across multiple domains. Instead of separate subscription systems for each domain, a single subscription request from the first node covers events in both the first and second domains, simplifying the overall system architecture
Solution Approach 2:
The second node sends a confirmation indication back to the first node when the subscription is established. This feedback loop ensures that the first node knows when event monitoring is active in the second domain, enabling coordinated management across domains
Data Source
AI summary
A method, performed by a first node (111), for handling subscriptions in a communications network (100). The first node (111) operates in the communications network (100). The first node (111) sends (303), to a second node (112), a first indication. The first indication requests subscription to report new accessibility for a device (140) to a second domain different than a first domain currently accessible by the device (140). The first node (111) receives (304) a second indication from the second node (112). The second indication indicates the new accessibility by the device (140) to the second domain. A fifth node (115) receives (501), from the first node (111), a fifth indication indicating a notification of an event by the device (140) after the new accessibility has been enabled. The fifth indication is received based on a previous indication sent by the fifth node (115) prior to the new accessibility has been enabled.