Adaptive Handover Parameter Setting for 5G Mobility
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Solution Overview
Problem
Current 5G communication systems lack a method to adaptively set handover parameters based on the type of serving and target evolved Node B (eNB) and user equipment (UE) movement speed, leading to inefficiencies in handover processes, such as delayed handovers or unnecessary ping-pong phenomena.
Innovation Solution
A method and apparatus for setting Time-To-Trigger (TTT) parameters in a mobile communication system, where a UE receives cell type and mobility information from a serving eNB, detects the types of serving and target eNBs, and sets TTT as short or long based on signal strength and movement speed to optimize handover timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed handover parameter is used for all eNB types and mobility conditions, then the system complexity is reduced and ease of operation is improved, but handover efficiency deteriorates due to delayed handovers or unnecessary ping-pong phenomena
Solution Approach 1:
The patent applies dynamics by making the handover parameter (TTT) variable rather than fixed. The TTT is dynamically adjusted based on the serving eNB type, target eNB type, and UE mobility state (low, medium, high). This allows the system to adapt handover timing to current conditions, improving handover efficiency while maintaining reasonable operational complexity through automated detection and adjustment.
Solution Approach 2:
The patent changes the parameter TTT based on different eNB types and mobility states. Specifically, it sets TTT to short or long values depending on the combination of serving eNB type (macro/small), target eNB type, and UE mobility state. This parameter adaptation resolves the contradiction by optimizing handover timing for each scenario without requiring manual configuration.
2Productivity
If handover parameter is adapted based on eNB types and mobility information, then handover efficiency is improved, but device complexity increases due to additional detection and setting operations
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously detect its own mobility state and determine the appropriate TTT based on pre-configured parameters received from the network. The UE independently evaluates the serving eNB type, target eNB type, and its own mobility conditions, then automatically selects the optimal TTT without requiring complex network-side control or additional signaling overhead.
Solution Approach 2:
The patent applies preliminary action by having the network pre-configure TTT parameters for different eNB types and mobility states before the handover scenario occurs. The UE receives and stores these parameters in advance, allowing it to quickly determine the appropriate TTT during handover events without real-time complex calculations, thereby reducing device complexity while maintaining handover efficiency.
3Reliability
If a long TTT is used to avoid unnecessary handovers, then reliability is improved by reducing ping-pong phenomena, but handover speed deteriorates causing delayed handovers when needed
Solution Approach 1:
The patent applies dynamics by making the TTT duration adaptive rather than static. It sets TTT to short values when UE mobility is low and the target eNB provides significantly better service, enabling fast handover. Conversely, it sets TTT to long values when UE mobility is high or the signal difference is marginal, preventing unnecessary handovers and ping-pong phenomena. This dynamic adjustment resolves the contradiction between reliability and handover speed.
4Speed
If a short TTT is used to enable fast handover, then handover speed is improved, but reliability deteriorates due to increased ping-pong phenomena and unnecessary handovers
Solution Approach 1:
The patent changes the TTT parameter based on specific conditions: it uses short TTT only when UE mobility is low and the target eNB signal is significantly stronger than the serving eNB. When UE mobility is medium or high, or when the signal difference is not substantial, it uses long TTT to filter out transient conditions. This conditional parameter adjustment achieves fast handover when appropriate while preventing ping-pong phenomena, resolving the reliability-speed contradiction.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method of setting a handover parameter includes receiving, from a serving evolved NodeB (eNB), cell type information indicating eNB types of the serving eNB and eNBs adjacent to the serving eNB, and mobility information of the UE, detecting types of the serving eNB and a target eNB based on the cell type information, and setting a Time-To-Trigger (TTT) applied, the mobility information of the UE, and a received signal strength for the serving eNB.