RedCap Mobility Prioritization for Compatible Cell Handover
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Solution Overview
Problem
Reduced capability user equipment (RedCap) devices face service interruption and power consumption penalties due to the need to reestablish connections with cells that do not support their capabilities during handover or redirection, leading to radio link failures (RLF) and service disruptions.
Innovation Solution
RedCap UEs prioritize conditional handover or conditional primary serving cell change to cells that support their capabilities by maintaining a ranked list of such cells and performing handover or redirection only to those cells, avoiding handover or redirection to cells that do not support their capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RedCap UEs perform handover or redirection to cells that do not support their capabilities, then handover or redirection can be completed, but service interruption and power consumption penalties occur due to connection reestablishment
Solution Approach 1:
The network performs preliminary actions by broadcasting capability support information for neighbor cells before handover is needed. The UE uses this advance information to pre-identify suitable cells that support RedCap capabilities, avoiding the need to reestablish connections during handover and thus preventing service interruption and excessive power consumption.
Solution Approach 2:
The system implements feedback by broadcasting cell capability support information to UEs. This feedback mechanism allows UEs to make informed handover decisions based on whether target cells support their capabilities, thereby maintaining service continuity and reducing power consumption penalties associated with connection reestablishment.
2Ease of operation
If RedCap UEs perform handover or redirection to cells that do not support their capabilities, then handover or redirection can be completed, but radio link failures and service disruptions occur
Solution Approach 1:
The network broadcasts capability support information for neighbor cells in advance, enabling UEs to pre-identify suitable target cells that support RedCap capabilities. This preliminary information allows UEs to complete handover to compatible cells without experiencing radio link failures or service disruptions.
Solution Approach 2:
The broadcast of cell capability information provides feedback to UEs, enabling them to make informed handover decisions. This feedback mechanism ensures that UEs can complete handover operations smoothly by selecting only those cells that support their capabilities, thereby maintaining service continuity.
3Reliability
If RedCap UEs maintain a ranked list of compatible cells and prioritize conditional handover to such cells, then service continuity is maintained, but device complexity increases
Solution Approach 1:
The network performs preliminary actions by broadcasting capability support information, which simplifies the UE's task. Instead of complex autonomous evaluation, the UE can directly use the broadcast information to identify and rank compatible cells, reducing device complexity while maintaining service continuity through conditional handover to pre-identified suitable cells.
Data Source
AI summary
Aspects described herein relate to receiving, for a first cell, a broadcast signal including an indication that the first cell supports reduced capability UE, and prioritizing, based on the indication, conditional handover or conditional cell change from a serving cell to the first cell over handover or redirection from the serving cell to a second cell.