Cell Reselection Using RRC Inactive-Mode Cell Priority
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Solution Overview
Problem
Existing wireless communication systems fail to effectively utilize the characteristics of RRC inactive mode, leading to increased latency, signaling overhead, and power consumption, particularly for services like Ultra-Reliable Low-Latency Communications (URLLC) and massive IoT, due to inefficient cell reselection processes that result in the UE falling back to idle mode when cells do not support inactive mode.
Innovation Solution
A method and apparatus for cell reselection in a wireless communication system that prioritizes neighboring cells supporting the inactive mode, utilizing stored cell information and context to maintain the inactive mode, thereby reducing signaling overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs cell reselection to a neighboring cell that does not support inactive mode, then the UE can connect to available cells, but the UE falls back to idle mode resulting in increased signaling overhead and latency
Solution Approach 1:
The UE performs preliminary actions by storing cell information and inactive mode support status before reselection occurs. When a trigger for reselection is detected, the UE uses this pre-stored information to identify and prioritize neighboring cells that support inactive mode, thereby avoiding the need to fall back to idle mode and reducing the latency associated with mode transitions.
Solution Approach 2:
The system implements feedback by using stored cell information about inactive mode support status. This feedback mechanism allows the UE to make informed reselection decisions by referencing previously gathered information about which cells support inactive mode, thereby maintaining connectivity without falling back to idle mode and reducing signaling overhead.
2Reliability
If the UE performs cell reselection to a neighboring cell that does not support inactive mode, then the UE can connect to available cells, but the signaling overhead increases due to mode transition
Solution Approach 1:
The UE performs preliminary actions by storing cell information and inactive mode support status before reselection occurs. When a trigger for reselection is detected, the UE uses this pre-stored information to identify and prioritize neighboring cells that support inactive mode, thereby avoiding the need to fall back to idle mode and reducing the latency associated with mode transitions.
Solution Approach 2:
The system implements feedback by using stored cell information about inactive mode support status. This feedback mechanism allows the UE to make informed reselection decisions by referencing previously gathered information about which cells support inactive mode, thereby maintaining connectivity without falling back to idle mode and reducing signaling overhead.
3Loss of time
If the UE prioritizes cells supporting inactive mode during reselection, then the latency and signaling overhead are reduced, but the UE may have limited cell options
Solution Approach 1:
The UE applies local quality by differentiating between cells based on their inactive mode support status. Cells are categorized into those that support inactive mode and those that do not, allowing the UE to prioritize cells with the desired quality attribute (inactive mode support) while still considering other cells as fallback options, thus maintaining adaptability.
Solution Approach 2:
The cell reselection process is made dynamic by allowing the UE to adapt its selection criteria based on stored cell information. The UE can dynamically adjust its priorities between cells supporting inactive mode and other available cells, providing flexibility while maintaining a preference for cells that reduce latency and signaling overhead.
Data Source
AI summary
The present disclosure relates to an apparatus and method for cell reselection in a wireless communication system. The method comprises: determining whether a User Equipment (UE) is in an inactive mode supported by a serving cell and detecting a trigger for reselection of the serving cell for the UE, while the UE is in the inactive mode. The method further comprises identifying, based on the detection, a plurality of neighbouring cells available for being connected to the UE. The method also comprises selecting a first cell, from among the plurality of the neighbouring cells, that supports the inactive mode of the UE, for connecting with the UE.