User Equipment Cell Selection with HPLMN Signal Thresholds
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Solution Overview
Problem
Existing mobile communication networks face issues with user equipment failing to receive and transmit data due to unfavorable radio coverage conditions, as conventional cell selection criteria do not adequately consider signal strength or quality, leading to devices being stuck on suboptimal networks and unable to switch to better options.
Innovation Solution
Implement a HPLMN-provided cell selection criterion that requires reception conditions to exceed predefined thresholds, ensuring only suitable cells are considered for network selection, allowing user equipment to register and transmit data effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell selection criteria are used, then user equipment can register to available networks, but data transmission fails in unfavorable radio coverage conditions
Solution Approach 1:
The patent introduces a new parameter Qrxlevmeas representing actual received signal strength, and compares it against a newly defined threshold Qrxlevmin_offset. This parameter change transforms the cell selection criterion from a simple binary check to a quantitative assessment that accounts for actual radio conditions, thereby improving data transmission reliability while maintaining automated operation.
Solution Approach 2:
The patent implements a feedback mechanism where the user equipment continuously measures the received signal strength (Qrxlevmeas) and compares it with the threshold (Qrxlevmin_offset). Based on this feedback comparison, the device dynamically adjusts its network selection behavior - either proceeding with registration or rejecting the cell - ensuring reliable data transmission while automating the decision process.
2Productivity
If automatic network selection mode is used, then user equipment can switch networks automatically, but devices get stuck on suboptimal networks with poor signal quality
Solution Approach 1:
The patent modifies the automatic network selection process by introducing a new signal strength parameter Qrxlevmeas and threshold Qrxlevmin_offset. This parameter change enables the automated selection process to evaluate actual signal quality, preventing devices from settling on suboptimal networks while maintaining efficient automatic switching capability.
Solution Approach 2:
The patent performs a preliminary signal strength assessment (comparing Qrxlevmeas against Qrxlevmin_offset) before the user equipment commits to network registration. This preliminary action ensures that only cells with adequate signal quality are selected, preventing the device from getting stuck on suboptimal networks while preserving automatic selection efficiency.
3Adaptability or versatility
If cell selection criteria are relaxed, then more networks become available for selection, but data transmission fails due to poor reception conditions
Solution Approach 1:
The patent introduces a new threshold parameter Qrxlevmin_offset that is specifically designed to ensure adequate reception conditions. By comparing the actual signal strength Qrxlevmeas against this carefully calibrated threshold, the system maintains flexibility in network selection (allowing multiple networks to be evaluated) while ensuring that only cells with sufficient signal quality are selected for data transmission.
4Reliability
If stringent cell selection criteria are applied, then data transmission reliability improves, but fewer networks are available for selection
Solution Approach 1:
The patent applies a stringent signal strength threshold Qrxlevmin_offset that is calibrated to ensure adequate reception conditions for successful data transmission. By comparing Qrxlevmeas against this threshold, the system reliably filters out cells with poor signal quality while still maintaining adaptability by evaluating all available networks and selecting the best suitable option that meets the criterion.
Data Source
AI summary
A method for realizing cell selection by a user equipment includes the following steps: in a first step, suitable radio cells of a considered radio access technology are determined by the user equipment based on a home public land mobile network (HPLMN)-provided cell selection criterion regarding the considered radio access technology; and in a second step, upon initiating network selection according to an automatic network selection mode, only such suitable radio cells are considered for network selection of the user equipment that have or correspond to reception conditions corresponding to or exceeding the HPLMN-provided cell selection criterion.