Cell Handover Uplink Grant Preconfiguration for Low Interruption
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Solution Overview
Problem
In 5G mobile communication systems, cell handovers can cause interruptions due to the need for random access, and existing methods for configuring uplink grants either increase interruption time through network interaction or result in low resource utilization.
Innovation Solution
A method where network devices negotiate to pre-configure or dynamically configure uplink resources for terminal devices based on synchronization and configuration requests, reducing interruption time and improving resource utilization by optimizing the timing and availability of uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the uplink grant is dynamically configured through network interaction, then the terminal device can obtain uplink resources for handover, but the interruption time increases due to interaction between network devices
Solution Approach 1:
The source network device pre-configures uplink grant resources for the terminal device before handover occurs. This preliminary configuration eliminates the need for real-time network interaction during handover, thereby reducing interruption time while ensuring reliable resource availability for the target cell
2Loss of time
If the uplink grant is pre-configured for one terminal device, then the interruption time is reduced, but the uplink grant resource utilization decreases because it cannot be flexibly configured for another terminal device
Solution Approach 1:
The patent implements a dynamic resource allocation mechanism where uplink grant resources are initially pre-configured but can be released and re-allocated to other terminal devices when not in use. This dynamic management maintains low interruption times while improving overall resource utilization through flexible reconfiguration
Solution Approach 2:
When a terminal device completes handover or releases the pre-configured uplink grant, the resource is recovered and made available for allocation to other terminal devices. This recycling mechanism ensures high resource utilization while maintaining the benefits of pre-configuration for active handovers
3Ease of operation
If the terminal device performs random access to access the target cell, then the access process is standardized, but the interruption time increases
Solution Approach 1:
The terminal device performs uplink synchronization before handover using pre-configured resources, eliminating the need for random access during handover. This preliminary synchronization action maintains standardized access procedures while significantly reducing interruption time by avoiding post-handover random access delays
Data Source
AI summary
A cell handover method and an apparatus are provided. A first network device receives a first message or a second message from a second network device, where the first message is used to request to provide a first uplink resource of at least one candidate cell, the second message is used to request to activate a second uplink resource of the at least one candidate cell, and the first uplink resource and the second uplink resource are used by a first terminal device to access the at least one candidate cell; and sends a third message to the second network device based on the first message, or sends a fourth message to the second network device based on the second message, where the third message includes information about the first uplink resource, and the fourth message indicates that the first network device has activated the second uplink resource.