User Equipment Core Network Context Fetch for Seamless Mobility
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Solution Overview
Problem
User equipment experiences connection loss when moving out of the coverage area of a base node that does not support the same core network as the previous base node, leading to the inability to resume a data exchange session due to lack of access to the previous core network.
Innovation Solution
The user equipment identifies a second base node with access to a different core network, sends a connection reestablishment message with a core context fetch instruction, and resumes the data exchange session using a new device identity and encryption keys generated for the second core network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If user equipment moves to a base node that does not support the same core network, then mobility is maintained, but connection continuity is lost
Solution Approach 1:
The patent introduces a core network context fetch mechanism as an intermediary process. When UE moves to a base node supporting a different core network, the new base node acts as an intermediary to fetch the UE's context from the original core network and translate/adapt it to the new core network environment, thereby maintaining connection continuity during mobility
Solution Approach 2:
The patent implements preliminary actions by having the base node proactively fetch the UE's context from the original core network before the UE establishes connection in the new core network. This preliminary context retrieval enables seamless connection resumption without interruption when UE moves between base nodes with different core network support
2Duration of action of stationary object
If user equipment maintains connection to original core network, then data exchange session continuity is preserved, but base node compatibility is reduced
Solution Approach 1:
The patent makes the base node universal by enabling it to support multiple core networks. The base node can now serve UEs connected to different core networks (EPC, 5GC, etc.) by fetching contexts from the appropriate core network and adapting them, thus increasing base node compatibility without compromising session continuity
Solution Approach 2:
The patent changes the operational parameters of the base node by introducing dynamic core network selection and context adaptation capabilities. The base node can now adjust its operating parameters based on which core networks are available and fetch appropriate context parameters to maintain session continuity across different core network environments
3Reliability
If user equipment sets up new connection when moving base nodes, then base node support is ensured, but connection setup time increases
Solution Approach 1:
The patent applies preliminary action by having the base node fetch the UE's context from the original core network in advance, before the UE needs to establish connection in the new core network. This pre-fetching of context information eliminates the time-consuming process of setting up new connections, as the context is already prepared and available for immediate use
Data Source
AI summary
Provided herein is a system, components, and methods for a user equipment therein operating on a first base node of a cellular network, the first base node communicatively coupled to two core networks of said cellular network, the user equipment operating in an open data exchange session by means of a data exchange context terminating in selected one of the two core networks, the user equipment further maintaining a first device identity received from said selected core network. Other embodiments are disclosed.