On-Demand SIB1 Cell Selection With Reselection Fallback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing system information block 1 (SIB1) availability, particularly when base stations transmit SIB1 on an on-demand basis, as UEs struggle to determine if a cell provides SIB1 on-demand and may have difficulty obtaining the SIB1 request configuration.
Innovation Solution
The UE determines if a target cell provides SIB1 on an on-demand basis and handles scenarios where the SIB1 request configuration is not obtained within a threshold time by barring the target cell, setting a validity duration for the request configuration, and using an anchor cell as a proxy for time-frequency synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If base stations transmit SIB1 on an on-demand basis to reduce energy consumption, then energy efficiency is improved, but UEs struggle to determine if a cell provides SIB1 on-demand and have difficulty obtaining the SIB1 request configuration
Solution Approach 1:
The patent introduces an intermediary mechanism where the network provides explicit indication information (via MIB or SIB1) to tell UEs whether SIB1 is available on-demand in a cell. This intermediary signal resolves the detection difficulty by mediating between the network's energy-saving intent and the UE's need to know SIB1 availability before attempting to access it.
Solution Approach 2:
The patent implements preliminary action by having the network broadcast advance indication information (through MIB or SIB1) before the actual SIB1 transmission. This allows UEs to prepare in advance by knowing whether to attempt SIB1 acquisition or fall back to alternative cell selection, avoiding unnecessary transmission attempts and reducing energy waste.
2Reliability
If UEs continuously monitor SIB1 availability across multiple cells to ensure reliable communication, then communication reliability is improved, but time consumption and processing overhead increase
Solution Approach 1:
The network performs preliminary action by broadcasting advance indication information about SIB1 availability in cells before UEs need to access it. This allows UEs to make informed decisions about cell selection without continuously monitoring, reducing time consumption while maintaining reliability through proactive information provision.
Solution Approach 2:
The patent implements feedback mechanisms where the network provides indication information about SIB1 availability status. This feedback loop allows UEs to adjust their cell selection and SIB1 acquisition strategies based on real-time network conditions, improving reliability without requiring continuous monitoring of all cells.
3Measurement precision
If UEs attempt to acquire SIB1 from all candidate cells to ensure optimal cell selection, then cell selection accuracy is improved, but processing complexity and time requirements increase
Solution Approach 1:
The network performs preliminary action by providing advance indication information about which cells offer on-demand SIB1 service. This allows UEs to prioritize cells with available SIB1 configuration, reducing the number of cells that require full analysis and thus lowering processing complexity while maintaining selection accuracy.
Solution Approach 2:
The patent segments the cell selection process into two stages: first, filtering cells based on SIB1 availability indication information (low-complexity stage), and second, performing detailed measurement and evaluation only for cells that pass the first stage (high-precision stage). This segmentation reduces overall processing complexity while maintaining measurement precision.
Data Source
AI summary
An apparatus, operating in a radio resource control idle mode, selects from multiple candidate cells, a target cell to be a next serving cell for the apparatus. The apparatus starts, based on the target cell providing system information block 1 (SIB1) on an on-demand basis and in response to receiving a SIB1 request configuration for the target cell, a SIB1 request for the target cell based at least in part on the SIB1 request configuration for the target cell. The apparatus reselects, in response to receiving no SIB1 for the target cell in response to the SIB1 request, a secondary candidate cell of the multiple candidate cells on a same frequency as the target cell or on another frequency than the target cell based at least in part on whether intra-frequency reselection is allowed, and continues to consider the target cell in future cell selection or reselection evaluation.