RACH-less Handover Control via Conditional Reconfiguration
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Solution Overview
Problem
In cellular communication systems, existing technologies face challenges in efficiently managing handovers, particularly in scenarios involving mobile relay nodes, which can lead to service interruptions and increased radio resource loads.
Innovation Solution
The proposed communication control method involves transmitting conditional reconfigurations from a base station to user equipment, including permission information for RACH-less handover, and using a donor node to manage the execution of these configurations through transmission indications and execution indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in mobile relay node scenarios, then connection reliability is maintained through established protocols, but service interruptions occur and radio resource loads increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring conditional reconfiguration parameters and permission information in the target cell before handover is needed. The UE receives and stores handover execution conditions, target cell configurations, and RACH-less handover permissions in advance, so that when handover conditions are met, the UE can immediately execute handover without waiting for network signaling, thereby reducing service interruption time while maintaining connection reliability
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously determine whether to execute handover based on pre-configured conditions and permission information. The UE independently evaluates handover conditions, selects target cells, and executes RACH-less handover without real-time network intervention, reducing service interruptions and radio resource loads while maintaining reliable connections
2Extent of automation
If traditional handover procedures are used, then network control is maintained through centralized management, but radio resource loads increase during handover processes
Solution Approach 1:
The patent applies segmentation by dividing handover control into two parts: the network segment (donor gNB) that provides conditional reconfiguration parameters and permission information, and the UE segment that autonomously executes handover decisions. This segmentation reduces radio resource load during handover by minimizing real-time network-UE signaling while maintaining network control through pre-configured parameters and permission information
Solution Approach 2:
The patent uses pre-configured conditional reconfiguration parameters and permission information as intermediaries between the network and UE. These intermediaries carry handover execution conditions, target cell configurations, and RACH-less handover permissions, enabling the UE to make autonomous handover decisions without continuous network intervention, thereby reducing radio resource loads while maintaining network control
3Speed
If RACH-less handover is permitted, then handover speed is improved by skipping random access procedures, but connection reliability may be compromised without proper permission management
Solution Approach 1:
The patent applies parameter changes by introducing permission information as a control parameter that determines whether RACH-less handover is allowed. The donor gNB configures permission information indicating whether the UE can perform RACH-less handover to specific target cells, and the UE checks this permission before executing handover. This parameter control enables fast handover when permitted while maintaining connection reliability through proper permission management
Solution Approach 2:
The patent implements feedback by having the UE check permission information before executing RACH-less handover and by the donor gNB providing conditional reconfiguration parameters that include handover execution conditions. The UE feeds back handover completion status to the network, enabling fast handover when conditions are met while maintaining connection reliability through feedback-based permission verification
Data Source
AI summary
A communication control method according to one aspect is a communication control method used in a cellular communication system. The communication control method includes transmitting, at a base station to a user equipment, a conditional reconfiguration including permission information representing whether connection by RACH-less handover is permitted per target cell.