Home NodeB Gateway User Context Allocation for Handover
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Solution Overview
Problem
The handover procedure in cellular wireless communication systems cannot be completed normally when the target cell is a home NodeB, as the target home NodeB and home NodeB gateway lack the necessary user context identifier, preventing successful signaling message correspondence.
Innovation Solution
A method and apparatus that involve the target home NodeB gateway generating a user context and allocating a user context identifier when receiving a relocation request message, and sending this identifier along with the relocation request message to the target home NodeB, ensuring proper handover processing even when the user has not initiated an NAS message in the target cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user performs cell handover to a target home NodeB without initiating NAS message in the target cell, then the handover procedure cannot be completed normally, but requiring user registration beforehand increases system complexity and delays handover
Solution Approach 1:
The target home NodeB gateway proactively creates a user context and allocates a user context identifier before the handover is fully completed. This preliminary action ensures that the necessary user identification information is ready in advance, allowing the handover procedure to succeed without requiring the user to initiate a NAS message first.
Solution Approach 2:
The patent introduces a user context identifier as an intermediary element that bridges the gap between the existing registration-based system and the handover scenario. This identifier serves as a temporary substitute for the traditional user context that would normally be established through NAS message initiation, enabling seamless handover without full registration.
2Reliability
If the target home NodeB gateway lacks user context identifier information, then signaling message correspondence fails, but implementing traditional registration process before handover increases handover time
Solution Approach 1:
The target home NodeB gateway performs preliminary actions by creating the user context and allocating the user context identifier during the handover preparation phase, before the handover execution phase. This ensures that signaling message correspondence is established in advance, eliminating delays that would occur if registration were required after handover initiation.
Solution Approach 2:
The patent extracts the essential function of user context establishment from the complete registration process. By separating the user context creation and identifier allocation from the full NAS-based registration flow, the system achieves signaling message correspondence without the time-consuming elements of traditional registration.
3Loss of information
If the system requires user registration before handover, then user context identifier is available, but the handover procedure becomes more complex and time-consuming
Solution Approach 1:
The patent extracts only the necessary components (user context creation and identifier allocation) from the complete registration process, discarding the redundant parts. This selective extraction ensures user context identifier availability while simplifying the handover procedure by eliminating unnecessary registration steps.
Solution Approach 2:
The system performs the essential user context preparation actions preliminarily, during the handover preparation phase rather than requiring a separate registration phase. This timing optimization reduces handover complexity by integrating context creation into the existing handover workflow.
Data Source
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AI summary
A Method and apparatus for a user handing over to a home NodeB are provided. The method comprises the following steps: when the user initiates a handover procedure from a source NodeB to a target home NodeB, a target home NodeB gateway receiving a relocation request message from a mobility management unit of a core network; the target home NodeB gateway generating a user context for the user according to the relocation request message, allocating a user context identifier for the user context, and sending the user context identifier and the relocation request message to the target home NodeB; and when receiving a relocation request acknowledgement message replied by the target home NodeB, the target home NodeB gateway sending the relocation request acknowledgement message to the mobility management unit of the core network. The application of the above technical solution can ensure the handover of a user to a home NodeB which serves as a target NodeB successfully.