CSG Cell Selection Priority Mechanism for LTE Power Reduction
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Solution Overview
Problem
Current cell selection and reselection criteria for Closed Subscriber Group (CSG) cells in LTE networks lack priority schemes, efficient parameter definitions, and optimized procedures, leading to increased time and power consumption in determining CSG cell availability and reselection.
Innovation Solution
Implementing a method for applying priority information to CSG cells, grouping CSG cells based on purpose, and defining specific parameters like Qhyst and Qoffset for effective cell selection and reselection, including manual selection and reselection procedures, to optimize WTRU operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the WTRU reads system information blocks (SIBs) to determine CSG cell configuration, then the WTRU can identify available CSG cells, but the time and power consumption increases significantly
Solution Approach 1:
The patent extracts the CSG cell identification and priority information from the detailed system information blocks (SIBs) and places it in a more accessible location (SIB1 or dedicated signaling). This allows the WTRU to identify available CSG cells without reading through hundreds of SIBs, significantly reducing power consumption while maintaining complete information about CSG cell availability.
Solution Approach 2:
The patent implements preliminary action by providing CSG cell identification and priority information in advance through dedicated signaling or SIB1, before the WTRU needs to perform detailed SIB reading. This preliminary provision of information allows the WTRU to make quick decisions about which CSG cells to access, avoiding the need to read extensive SIBs and thereby reducing power consumption.
2Loss of information
If the WTRU reads system information blocks (SIBs) to determine CSG cell configuration, then the WTRU can identify available CSG cells, but the time consumption increases significantly
Solution Approach 1:
The patent extracts the essential CSG cell identification and priority information from the detailed system information blocks (SIBs) and places it in a more accessible location (SIB1 or dedicated signaling). This allows the WTRU to identify available CSG cells without reading through hundreds of SIBs, significantly reducing time consumption while maintaining complete information about CSG cell availability.
Solution Approach 2:
The patent implements preliminary action by providing CSG cell identification and priority information in advance through dedicated signaling or SIB1, before the WTRU needs to perform detailed SIB reading. This preliminary provision of information allows the WTRU to make quick decisions about which CSG cells to access, avoiding the need to read extensive SIBs and thereby reducing time consumption.
3Productivity
If priority schemes are implemented for CSG cells, then cell selection and reselection efficiency is improved, but the system complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing a priority parameter associated with each CSG cell. This simple parameter addition enables the WTRU to efficiently select and reselect cells by comparing priority values, improving cell selection efficiency without requiring complex algorithms. The priority parameter works alongside existing cell selection criteria to provide streamlined decision-making.
Data Source
AI summary
Apparatuses and methods are provided for performing cell reselection. A method includes camping on a non-closed subscriber group (CSG) cell that is selected using frequency priorities; scanning other frequencies for non-CSG cells and CSG cells; detecting a CSG cell being a highest ranked cell on a frequency different than a frequency of the non-CSG cell that the WTRU is camped on; and selecting the detected CSG cell, being on a whitelist, and disregarding the frequency priorities in cell selection.