Inter-Network Mobility Using Reserved UE Context for Fast Reconnection
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Solution Overview
Problem
The challenge of reducing service delay due to the process of reestablishing session resources when a terminal device moves between networks, particularly in non-public networks (NPNs) and public land mobile networks (PLMNs), is addressed by implementing an inter-network mobility method that facilitates quick restoration of terminal device configuration.
Innovation Solution
The method involves an access device sending indications to the terminal device to reserve and manage information across networks, including context, signaling and data radio bearers, identifiers, and network addresses, to avoid repeated configuration and authentication procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device reestablishes session resources after moving from the first network to another network, then the terminal device can access the target network, but service delay is caused due to the process of establishing session resources
Solution Approach 1:
The patent applies preliminary action by having the terminal device reserve configuration information (such as radio bearer configurations, security contexts, and network identifiers) in the first network before actually moving to another network. When the terminal device returns to the first network, this pre-reserved information enables rapid restoration of session resources without requiring complete reconfiguration, thus reducing service delay while maintaining reliable network access capability
Solution Approach 2:
The patent uses copying by creating and storing a copy of the terminal device's configuration information (radio bearer configurations, security contexts, network identifiers) in the first network while the terminal device is temporarily in another network. This copied information serves as a template that can be quickly restored when the terminal device returns, avoiding the need to recreate the entire configuration from scratch and thereby reducing the time required for session resource establishment
2Reliability
If the terminal device reestablishes session resources after moving across networks, then the terminal device can restore network connectivity, but configuration complexity increases due to repeated configuration procedures
Solution Approach 1:
The patent reduces configuration complexity by performing preliminary reservation of configuration information in the first network before the terminal device moves away. The access device or terminal device reserves radio bearer configurations, security contexts, and network identifiers in advance. When the terminal device returns, this pre-reserved information is directly reused rather than requiring complex repeated configuration procedures, thereby maintaining network connectivity while significantly simplifying the restoration process
Solution Approach 2:
The patent applies copying by creating and maintaining a copy of the terminal device's complete configuration state (including radio bearer configurations, security contexts, and network identifiers) in the first network. This copied configuration information serves as a ready-to-restore template that eliminates the need for complex reconfiguration procedures when the terminal device returns, thereby reducing configuration complexity while ensuring reliable network connectivity restoration
3Reliability
If the terminal device performs authentication and registration procedures when accessing network services after moving to another network, then the terminal device can access network services, but delay is caused due to repeated authentication and registration procedures
Solution Approach 1:
The patent applies preliminary action by having the terminal device reserve not only configuration information but also authentication credentials and registration data in the first network before moving to another network. When the terminal device returns to the first network, these pre-reserved authentication and registration information can be quickly validated without requiring the terminal device to undergo complete authentication and registration procedures again, thereby reducing authentication delay while maintaining reliable network service access
Solution Approach 2:
The patent uses copying by creating and storing a copy of the terminal device's authentication credentials, security contexts, and registration information in the first network while the terminal device is temporarily in another network. This copied authentication information enables rapid re-validation when the terminal device returns, avoiding the time-consuming process of repeated complete authentication and registration procedures while ensuring secure and reliable network service access
Data Source
AI summary
The present disclosure relates to inter-network mobility methods, apparatus, and communications devices. In one example method, a first access device sends a first indication to a terminal device, where the first indication is used to indicate the terminal device to reserve first information after the terminal device moves from a first network to a network other than the first network, and the first information includes one or more of a context of the terminal device in the first network, information about a signaling radio bearer (SRB) in the first network, information about a data radio bearer (DRB) in the first network, an identifier of the terminal device in the first network, information about a first cell in which the first access device provides a service for the terminal device, an identifier of the first network, or a cause value.