UE Candidate Cell Resource Retention for 5G Mobility
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in minimizing service interruption delays and signaling overhead during user equipment (UE) mobility, particularly in the serving cell change procedure.
Innovation Solution
A method where the user equipment (UE) receives messages with indications to keep or release resources of candidate cells, allowing for efficient cell access and resource management, thereby optimizing mobility enhancements and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE releases resources of candidate cells after accessing a target cell, then the signaling overhead is reduced, but the service interruption delay increases
Solution Approach 1:
The network configures multiple candidate cells with pre-prepared resource information before the handover. The UE stores this information locally and can immediately access a target cell without waiting for resource configuration during handover, thereby reducing service interruption delay while avoiding excessive signaling overhead.
2Loss of time
If the UE keeps resources of candidate cells during mobility, then the service interruption delay is reduced, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the essential resource information (such as physical layer configuration) from the complete resource setup and stores it locally in the UE. This selective extraction reduces the amount of data that needs to be signaled and stored, thereby reducing signaling overhead while still enabling fast access to candidate cells.
Solution Approach 2:
Different types of resource information are treated differently: critical resources needed for immediate access are stored locally in the UE, while less critical information is managed by the network. This local quality differentiation reduces overall signaling overhead while maintaining fast handover capability.
3Reliability
If the network configures multiple candidate cells with resource information, then the mobility reliability is improved, but the device complexity increases
Solution Approach 1:
The network configures multiple candidate cells with resource information, but the UE only actively processes and stores information for a limited number of cells that are most likely to be target cells based on measurement results. This partial processing approach maintains mobility reliability through multiple candidates while reducing UE processing complexity.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure provides a method performed by a user equipment (UE) in a wireless communication system. The method includes: receiving a message including a first indication, wherein the first indication is used to indicate keeping resources of candidate cells; and determining a target cell from the candidate cells and performing cell access.