Inter-cell Handover Pre-allocation for Delay Reduction
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Solution Overview
Problem
Current inter-cell handover mechanisms, such as downlink and uplink measurement-based methods, face delays and inefficiencies in resource allocation, leading to potential handover failures, especially in high-density cellular environments with stringent delay and reliability requirements.
Innovation Solution
An inter-cell handover method where a source cell controller proactively sends a pre-handover request to a target cell controller to allocate resources before the terminal device triggers a handover condition, allowing for immediate execution of the handover when the condition is met, thereby reducing handover delay and improving success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink measurement-based handover mechanism is used, then network side can control handover based on UE measurement reports, but handover preparation causes delay to actual handover execution
Solution Approach 1:
The patent applies preliminary action by having the target cell prepare handover resources in advance upon receiving a pre-handover request from the source cell, before the actual handover execution is needed. This allows the target cell to allocate resources proactively, eliminating the delay caused by waiting for measurement reports and handover triggers.
2Loss of time
If uplink measurement-based handover mechanism is used, then handover time is reduced compared to downlink mechanism, but handover preparation still causes delay after trigger condition is met
Solution Approach 1:
The patent implements preliminary action by initiating resource preparation in the target cell before the handover trigger condition is met. The source cell sends a pre-handover request to the target cell, which then allocates resources in advance. This ensures that when the handover trigger occurs, resources are already ready, eliminating preparation delay and ensuring timely handover execution.
3Ease of manufacture
If traditional handover preparation process is executed after handover trigger, then resource allocation follows standard procedure, but handover cannot be performed in time for high-delay requirement services
Solution Approach 1:
The patent applies preliminary action by decoupling the handover trigger from the resource preparation timing. The target cell receives a pre-handover request from the source cell and begins resource allocation before the actual handover is needed. This maintains standardized procedures while achieving timely execution for services with stringent delay requirements.
Data Source
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AI summary
Embodiments of this application disclose an inter-cell handover method and a controller to shorten a handover delay. The method includes: determining, by a first controller, a target cell, where the first controller is a controller of a source cell; sending, by the first controller, a pre-handover request to a second controller, where the second controller is a controller of the target cell, and the pre-handover request is used to instruct the second controller to allocate, to a terminal device, a first resource required for a cell handover; and sending, by the first controller, a handover command to the terminal device when determining that the terminal device meets a handover condition, where the handover command is used to instruct the terminal device to be handed over from the source cell to the target cell based on the first resource.