UE-Based Handover in 5G mmWave Networks

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Solution Overview

Problem

In 5G networks, especially when using high-frequency bands like mmWave, the frequent handovers and propagation characteristics can lead to difficulties in maintaining communication connections between user equipment (UE) and base stations, resulting in potential disconnections and seamless communication challenges.

Innovation Solution

The proposed solution involves enabling the user equipment (UE) to determine whether to perform a handover based on information received from the base station, rather than relying solely on the base station. This is achieved through methods where the UE receives high-layer signaling including UE-based handover command information and handover execution condition information, allowing it to evaluate and decide on handover execution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the base station performs handover control in traditional networks, then the handover procedure is simple and easy to implement, but the handover speed is slow and communication connection may be disconnected during frequent handovers in 5G mmWave networks

Engineering Contradiction:

Improvehandover speedVSAvoidhandover procedure complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The base station pre-configures handover execution conditions and command information to the UE before actual handover is needed. The UE stores target cell configuration and evaluates conditions locally, preparing for rapid handover execution when conditions are met, eliminating the need for real-time base station decision-making during handover.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE autonomously evaluates handover execution conditions based on received signaling and independently decides whether to execute handover. The terminal-based handover enables the UE to self-manage the handover process by comparing measured downlink signals against threshold conditions without continuous base station intervention, significantly speeding up handover execution.

Inventive Principle:

Principle #25Self-service

2Reliability

If the UE autonomously determines handover execution based on received conditions, then the handover speed increases and connection stability improves, but the signaling overhead and processing complexity increase

Engineering Contradiction:

Improvecommunication connection stabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The base station transmits handover execution conditions and command information to the UE in advance through high-layer signaling. The UE stores this information and target cell configuration, so when handover is needed, the UE can immediately evaluate conditions and execute without additional real-time signaling, reducing signaling overhead while maintaining reliability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12294901B2Method for performing terminal-based handover and device therefor

Publication Date: 2025.05.06 KT CORP

AI summary

Provided are a method and a device for performing a UE-based handover in a next generation wireless access network. The method of a UE may include receiving, from a source base station, an upper layer signaling including information on UE-based handover command and information on conditions for handover execution; storing a target cell configuration by using the information on conditions for handover execution; and determining whether to perform a handover procedure to a target cell, by determining whether predetermined conditions for handover are satisfied.