5G Handover Control with Immediate State Timer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fast handover technologies in 5G mobile communication systems lead to excessive message transmission between base stations, wasting wireless communication resources, especially when a mobile terminal is near the boundary of two cells, causing repeated and unnecessary handover preparations.
Innovation Solution
Implementing a mobile terminal and base station configuration that maintains an immediate handover state for a predetermined waiting time after a handover, allowing for immediate reconnection to the original cell without re-preparation, and suspends the release of inter-base-station interfaces until the waiting time elapses, reducing unnecessary message transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a user terminal starts preparation for a handover before performing the handover to enable fast handover, then handover speed is improved, but message transmission frequency increases excessively, wasting wireless communication resources
Solution Approach 1:
The patent applies preliminary action by pre-establishing the inter-base-station interface and completing handover preparation in advance. When the mobile terminal is in the immediate handover state, the target base station and source base station have already exchanged necessary information and established connectivity, so that when handover is triggered, the terminal can switch immediately without additional message exchanges.
Solution Approach 2:
The patent introduces dynamic state management with two distinct handover states: immediate handover state and normal handover state. The system dynamically transitions between these states based on whether the mobile terminal is in coverage of a target cell. This dynamic approach allows the system to adapt message transmission behavior to current conditions, reducing unnecessary messages when in immediate handover state.
2Adaptability or versatility
If a mobile terminal apparatus located at or near the boundary between base station apparatuses repeatedly performs preparation operations for handovers to two different base station apparatuses, then handover adaptability is improved, but message transmission frequency increases excessively, wasting wireless communication resources
Solution Approach 1:
When the mobile terminal enters a target cell, the target base station proactively establishes the inter-base-station interface with the source base station and completes handover preparation in advance. This preliminary action ensures that even if the terminal oscillates between cells, the handover infrastructure is already in place, preventing repeated message exchanges for the same handover event.
Solution Approach 2:
The patent introduces the inter-base-station interface as an intermediary mechanism that mediates handover operations. This interface acts as a persistent connection between base stations, allowing them to coordinate handovers efficiently. When a mobile terminal is near a boundary, this intermediary structure enables the base stations to manage handover states without requiring frequent direct communication triggered by terminal movements.
3Productivity
If the inter-base-station interface is released immediately after handover to free up resources, then resource utilization is improved, but communication reliability deteriorates during potential immediate handover back scenarios
Solution Approach 1:
The patent applies preliminary action by maintaining the inter-base-station interface in an active state for a predetermined period after handover completion. This preliminary maintenance ensures that if the mobile terminal needs to handover back to the source cell immediately, the interface is already established and ready, eliminating the need for re-preparation and ensuring communication reliability during the maintenance period.
Data Source
AI summary
In order to prevent occurrence of the significantly frequent transmission of messages, a user terminal is configured such that, when a reception power of a target cell is equal to or greater than a first threshold value ThLOW, the user terminal starts preparation for a handover to the target cell, and when the reception power is equal to or greater than a second threshold value ThHIGH, the user terminal performs the handover to the target cell, and that, until a waiting time has elapsed after performing the handover, the user terminal, by using a timer, performs a timing control for maintaining an immediate handover state in which the user terminal can immediately perform a handover, and, when the waiting time has elapsed, the user terminal ends the immediate handover state.