Anchor-Cell Reselection Assistance for On-Demand System Information
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing on-demand system information acquisition, leading to increased network energy consumption and signaling overhead due to unnecessary SIB1 requests from user equipment (UE) attempting to access unsuitable cells.
Innovation Solution
An anchor cell provides a subset of information from a target cell's MIB and/or SIB1, including barring information and identifiers like PLMN, SNPN, and CAG, allowing the UE to determine suitability before transmitting SIB1 requests, thereby reducing unnecessary signaling and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If UE transmits SIB1 requests to all detected cells, then complete system information acquisition is achieved, but signaling overhead and energy consumption increase
Solution Approach 1:
The anchor cell provides a subset of target cell information (MIB and SIB1 parameters including barring information, PLMN identifiers, CAG identifiers) in advance through SIB1 request configuration. This preliminary action enables the UE to determine cell suitability before transmitting SIB1 requests, preventing energy-wasting requests to unsuitable cells while ensuring complete information acquisition for suitable cells.
Solution Approach 2:
The patent extracts only the essential subset of target cell information (barring information, PLMN IDs, CAG IDs, tracking area codes) from the full MIB and SIB1 content and provides it through the anchor cell. This extraction allows the UE to make suitability decisions without receiving or processing complete target cell system information, reducing unnecessary SIB1 requests while maintaining acquisition completeness for suitable cells.
2Loss of information
If UE transmits SIB1 requests to all detected cells, then system information is obtained, but signaling overhead increases
Solution Approach 1:
The anchor cell provides essential target cell parameters (barring information, PLMN identifiers, CAG identifiers, tracking area codes) in advance through SIB1 request configuration. This preliminary provision enables the UE to filter out unsuitable cells before transmitting SIB1 requests, significantly reducing signaling overhead while ensuring complete system information acquisition for suitable cells.
Solution Approach 2:
The patent extracts only the critical subset of target cell information needed for suitability determination (barring information, PLMN IDs, CAG IDs, TACs) from the complete MIB and SIB1 content. This extraction through the anchor cell allows the UE to make informed decisions about which cells warrant SIB1 requests, reducing overall signaling overhead while maintaining complete information acquisition for appropriate cells.
3Speed
If UE attempts to access cells without checking suitability, then access attempts are made quickly, but resource allocation efficiency decreases
Solution Approach 1:
The anchor cell provides target cell suitability information (barring information, PLMN identifiers, CAG identifiers) in advance through SIB1 request configuration. This preliminary information enables the UE to quickly determine cell suitability before access attempts, maintaining fast access speed for suitable cells while preventing wasted attempts on unsuitable cells, thereby improving overall resource allocation efficiency.
Data Source
AI summary
Various aspects of the present disclosure relate to providing reselection assistance information to a user equipment (UE), where an anchor cell (or serving cell) provides a request configuration to the UE that contains some information from a master information block (MIB) of a target cell and/or system information from the target cell. For example, the request configuration may include barring information from within the MIB of the target cell and a portion of system information associated with the target cell as being a cell suitable and/or accessible to the UE.