Cell Reselection in Shared Wireless Networks
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Solution Overview
Problem
In wireless communication systems, especially in LTE networks, cell reselection methods fail to optimally select a target cell when multiple operators share the same cell, leading to suboptimal service quality due to the use of common cell reselection information that prioritizes primary operators, potentially resulting in incorrect cell selection and additional movement procedures.
Innovation Solution
A method where a terminal obtains a public land mobile network (PLMN) list and cell reselection information from a serving cell, allowing it to perform cell reselection based on specific PLMN lists and information sets, including those optimized for secondary PLMNs, ensuring proper target cell selection and improved service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common cell reselection information is applied in a shared cell environment, then the cell reselection procedure is simplified, but the service quality deteriorates due to suboptimal target cell selection
Solution Approach 1:
The patent segments cell reselection information by PLMN, providing separate reselection information sets for different PLMNs operating in shared cells. This allows the terminal to select appropriate reselection information based on its registered PLMN, improving service quality without significantly increasing procedural complexity.
Solution Approach 2:
The patent applies local quality by providing customized cell reselection information tailored to each PLMN's specific requirements and characteristics. Each PLMN can have its own reselection parameters optimized for its service quality requirements, rather than using a generic common information set.
2Reliability
If multiple cell reselection information sets are provided for different PLMNs, then service quality improves through optimal target cell selection, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure and provide multiple PLMN-specific cell reselection information sets in advance. The terminal simply needs to select the appropriate information set based on its registered PLMN, avoiding the need for complex real-time analysis and reducing terminal processing complexity.
Solution Approach 2:
The terminal autonomously selects the appropriate cell reselection information set based on its registered PLMN identification, without requiring complex network control or additional signaling. This self-service approach minimizes system complexity while enabling PLMN-specific optimization.
3Device complexity
If common cell reselection information is used, then the information structure is simplified, but incorrect cell selection occurs leading to additional movement procedures
Solution Approach 1:
The patent segments cell reselection information into PLMN-specific sets, allowing accurate target cell selection from the first reselection attempt. This prevents incorrect cell selections and the need for additional movement procedures, reducing time loss while maintaining manageable information structure through systematic organization.
Data Source
AI summary
Provided is a method for user equipment reselecting a cell in a wireless communication system. The method comprises: obtaining a public land mobile network (PLMN) list from a serving cell, wherein the PLMN list lists a plurality of PLMNs according to businesses sharing the serving cell; obtaining cell reselection information from the serving cell, wherein the reselection information includes a plurality of cell reselection information sets related to the plurality of PLMNs; and reselecting the cell based on the PLMN list and the cell reselection list.