Candidate Cell Restriction for Low-Burden UE Mobility
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Solution Overview
Problem
In wireless communications, user equipment (UE) faces challenges in efficiently measuring a large number of candidate target cells during mobility, leading to processing burdens.
Innovation Solution
A method and apparatus for candidate cell restriction in wireless communication systems, where UE receives a list of cell configurations from a network, determines active candidate cells based on status information, and performs mobility to a target cell by applying a specific cell configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE measures all candidate target cells during mobility, then mobility decision accuracy is improved, but processing burden and time consumption increase
Solution Approach 1:
The patent segments the candidate target cells into two categories: active candidate cells and inactive candidate cells. The network node provides cell status information to indicate which cells are active and which are inactive. UE only measures reference signals for active candidate cells, thereby reducing processing burden while maintaining accurate mobility decisions based on the segmented cell list.
Solution Approach 2:
The patent extracts and removes inactive candidate cells from the measurement process. The network node identifies and excludes inactive cells from the candidate cell list provided to UE. This extraction ensures UE does not waste resources measuring cells that are not suitable for mobility, thus reducing processing time while preserving measurement accuracy for relevant cells.
2Measurement precision
If UE measures all candidate target cells during mobility, then mobility decision accuracy is improved, but processing burden increases
Solution Approach 1:
The patent segments the candidate target cells into active and inactive categories based on cell status information provided by the network node. This segmentation allows UE to focus measurement resources only on active candidate cells, reducing processing burden while maintaining accurate mobility decisions through targeted measurement of relevant cells only.
Solution Approach 2:
The patent extracts inactive candidate cells from the measurement process by having the network node provide a filtered candidate cell list that excludes inactive cells. This extraction reduces the number of cells UE must process and measure, thereby reducing processing burden while preserving measurement accuracy for the subset of active cells that are actually suitable for mobility.
3Adaptability or versatility
If network provides complete list of candidate cells, then mobility options are improved, but system overhead increases
Solution Approach 1:
The patent extracts and removes inactive candidate cells from the list provided to UE. The network node processes the complete cell list and provides only active candidate cells to UE, thereby reducing system overhead in terms of information transmission while preserving mobility options through the filtered list of suitable cells.
Solution Approach 2:
The patent applies local quality by providing different information to different UEs based on their specific conditions. The network node determines which cells are active for each UE based on UE-specific criteria and provides accordingly tailored candidate cell lists. This local quality approach reduces overall system overhead while maintaining adequate mobility options for each individual UE.
Data Source
AI summary
The present disclosure relates to candidate cell restriction for mobility in wireless communications. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system comprises: receiving, from a network via a current serving cell, a list of cell configurations for a plurality of candidate cells; determining first active candidate cells among the plurality of candidate cells based on first cell status information received from the network; determining a first target cell among the first active candidate cells based on measuring reference signals related to the first active candidate cells; and performing a mobility to the first target cell based on applying a cell configuration for the first target cell.