Conditional Handover Resource Reservation via Estimated Arrival Timing
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Solution Overview
Problem
Current conditional handover technologies in cellular networks lack efficient resource management, leading to prolonged resource reservation and reduced flexibility due to the absence of accurate timing information for user equipment (UE) arrival at target cells.
Innovation Solution
The introduction of an estimated arrival timing for UE handover at target cells, which includes a confidence level and probability distribution, allows for dynamic reservation and release of network resources based on predicted arrival times, optimizing resource utilization and reducing unnecessary reservations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network resources are reserved in advance for conditional handover, then handover reliability is improved, but resource utilization efficiency deteriorates due to prolonged reservation time
Solution Approach 1:
The patent applies preliminary action by preparing multiple candidate target cells and configuring handover conditions in advance, but the actual resource reservation is delayed until the UE actually needs handover. This resolves the contradiction by preparing what is needed (handover configuration) without committing resources prematurely, thus maintaining reliability while improving efficiency.
Solution Approach 2:
The patent implements dynamic resource management where network resources are reserved dynamically based on real-time conditions rather than statically in advance. The system adjusts resource reservation timing based on UE movement, signal conditions, and network load, allowing resources to be allocated only when handover is actually needed, thereby resolving the contradiction between reliability and efficiency.
2Reliability
If network resources are reserved in advance for conditional handover, then handover reliability is improved, but device complexity increases due to prolonged reservation management
Solution Approach 1:
The patent applies preliminary action by pre-configuring handover parameters and candidate target cells, but the actual resource reservation is deferred. This reduces complexity by avoiding prolonged reservation management while still ensuring handover reliability through advance preparation of handover configuration and conditions.
Solution Approach 2:
The patent extracts the resource reservation function from the handover preparation process. Instead of reserving resources as part of the preliminary handover setup, the system separates these functions: handover configuration is prepared in advance, but resource reservation is extracted and performed only when actually needed, thereby reducing management complexity while maintaining reliability.
3Loss of time
If handover command is sent early in advance, then handover preparation time is reduced, but resource allocation accuracy deteriorates due to lack of timing information
Solution Approach 1:
The patent applies preliminary action by sending handover commands early with advance configuration of multiple target cells and conditions. The system provides sufficient lead time for preparation while using condition-based triggering (rather than fixed timing) to maintain accuracy, resolving the contradiction by preparing early but triggering based on actual UE state rather than predetermined time.
Solution Approach 2:
The patent changes the parameter from fixed time-based handover triggering to condition-based triggering. Instead of relying on accurate predicted arrival timing, the system uses configurable handover conditions (signal strength, mobility state, network load) as triggers, allowing early command preparation while maintaining accuracy through adaptive condition evaluation rather than precise timing prediction.
Data Source
AI summary
A network node comprising:means for providing to one or more UE, a UE configuration for conditional handover from a serving cell to one or more target cells, wherein the UE configuration for conditional handover configures one or more conditions for executing conditional handover;means for providing to the one or more target cells, a network configuration for conditional handover from a serving cell to the one or more target cells, wherein the network configuration for conditional handover configures at least one or more network resources for conditional handover; wherein the network configuration for conditional handover provides at least an estimated arrival timing for a UE arriving for handover at a target cell.