Conditional Handover Mechanism for Cellular Network Signaling Optimization
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Solution Overview
Problem
The existing handover process in cellular networks experiences high signaling overhead due to frequent measurement reporting triggered by a lower signal strength threshold, which can lead to unreliable handover execution and increased network load.
Innovation Solution
Implementing a conditional handover mechanism that uses a second Time To Trigger (TTT) value and multiple thresholds for measurement reporting, allowing the user equipment (UE) to evaluate and delay handover execution based on configured conditions, and optimizing measurement reporting by limiting frequency and combining reports for multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a lower signal strength threshold is used to trigger handover, then the UE switches to a new cell sooner and more frequently, but signaling overhead increases and handover reliability decreases
Solution Approach 1:
The patent introduces a preliminary evaluation phase where the UE assesses multiple candidate cells against predefined criteria (signal strength threshold, cell load, interference levels) before executing handover. This preliminary action filters out unsuitable targets, preventing premature or inappropriate handover decisions that would compromise reliability while maintaining responsive switching when conditions are truly favorable.
Solution Approach 2:
The system implements feedback mechanisms where measurement reports from the UE are continuously monitored by the network, which then provides handover commands with specific execution conditions. The network adjusts handover parameters based on observed handover success rates and network load, creating a closed-loop control system that improves handover reliability while maintaining appropriate switching speed.
2Productivity
If a lower signal strength threshold is used to trigger handover, then the UE switches to a new cell sooner and more frequently, but signaling overhead increases
Solution Approach 1:
The patent combines multiple measurement reports for different candidate cells into a single consolidated handover decision. Instead of triggering separate handover procedures for each cell that exceeds the threshold, the UE evaluates all candidate cells simultaneously against the threshold and network conditions, merging the decision-making process into one optimized handover command that reduces redundant signaling.
Solution Approach 2:
The system dynamically adjusts handover parameters including the signal strength threshold, time-to-trigger values, and measurement reporting intervals based on network conditions and UE mobility patterns. By changing these parameters adaptively, the system maintains high handover responsiveness when needed while reducing signaling overhead during stable conditions, optimizing the trade-off between productivity and resource consumption.
3Speed
If handover command is executed immediately upon receiving measurement report, then handover responsiveness is high, but handover reliability decreases due to insufficient condition evaluation
Solution Approach 1:
The patent implements preliminary condition evaluation where the UE assesses multiple criteria (signal strength threshold, cell load, interference levels, mobility state) before executing handover. This preliminary action ensures that handover commands are only executed when truly appropriate conditions are met, improving reliability while maintaining responsive execution through pre-computed decision readiness.
Solution Approach 2:
The network acts as an intermediary between measurement reporting and handover execution. Instead of immediate UE-autonomous handover, the network receives measurement reports, evaluates network conditions, and sends handover commands with specific execution conditions. This intermediary role ensures reliable handover decisions by coordinating between UE measurements and network state, while maintaining speed through pre-prepared handover commands.
Data Source
AI summary
Briefly, in accordance with one or more embodiments, an apparatus of a user equipment (UE) comprises one or more baseband processors to decode a conditional handover command from a serving cell for the UE to connect with a target cell, and to evaluate a condition before executing the handover command, wherein a first time to trigger (TTT) is started in the event the condition is true, and wherein a second TTT is started in the event the condition is true at an expiration of the first TTT, and wherein the one or more baseband processors are to execute the conditional handover command when the condition is true after an expiration of the second TTT, and a memory to store the first TTT and the second TTT.