Cell Selection Criteria for Wireless Devices
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Solution Overview
Problem
Existing wireless communication networks face uneven resource usage due to devices with different output power classes, leading to inefficient capacity distribution, particularly in IoT networks where low-power devices consume disproportionate resources, affecting high-end users and network capacity.
Innovation Solution
Re-defining the cell suitability criterion to introduce a non-linear dependency on the maximum output power capability of user equipment (UE), allowing for flexible compensation through parameters like the Low Power Class (LPC) offset or alpha parameter, which adjusts the cell selection criteria based on the UE's power class, thereby controlling resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices with different output power classes use the same cell selection criterion, then all devices can access the network, but low-power devices consume disproportionate network resources
Solution Approach 1:
The patent applies local quality by making the cell selection criterion adaptive to each device's output power class. Instead of a uniform criterion, the network configures power-class-specific parameters (Qrxlevmin, Qqualmin, S_intrasearch, S_intersearch) that are locally optimized for each power class, ensuring low-power devices don't consume disproportionate resources while maintaining network access capability.
Solution Approach 2:
The patent changes parameters by introducing power class as a variable that modifies the cell selection criterion parameters. The network configures different Qrxlevmin, Qqualmin, and search threshold values based on the device's power class, transforming the static cell selection criterion into a dynamic, power-class-dependent set of parameters that optimize resource efficiency.
2Area of stationary object
If low-power devices are allowed to access the network with the same criteria as high-power devices, then coverage is extended, but system capacity is reduced
Solution Approach 1:
The patent applies local quality by configuring different cell selection and reselection parameters specifically for low-power devices. The network provides power-class-specific Qrxlevmin, Qqualmin, and search threshold values that are locally optimized to control low-power device access, extending coverage to areas where high-power devices cannot operate while preventing excessive resource consumption that would reduce system capacity.
3Device complexity
If uniform cell selection criteria are used for all power classes, then the criterion is simple to implement, but resource allocation becomes uneven
Solution Approach 1:
The patent changes parameters by introducing power class as a variable that modifies the cell selection criterion parameters. The network configures different Qrxlevmin, Qqualmin, and search threshold values based on the device's power class, transforming the static cell selection criterion into a dynamic, power-class-dependent set of parameters that optimize resource efficiency.
Solution Approach 2:
The patent applies self-service by having devices autonomously determine their power class and apply the appropriate cell selection criterion parameters that the network has configured for their specific power class. This self-service mechanism allows devices to automatically adjust their cell selection behavior without complex centralized control, maintaining implementation simplicity while achieving balanced resource allocation.
Data Source
AI summary
A method for selecting a cell by a wireless device in a wireless communication network is disclosed. The method comprises: receiving a signal from a cell associated with a network node; determining whether the signal from the cell satisfies a cell selection criterion, wherein the cell selection criterion is based at least in part on a parameter that controls a compensation to the cell selection criterion, the compensation being associated with a power class of the wireless device; and selecting the cell in response to a determination that the signal from the cell satisfies the cell selection criterion. A wireless device for carrying out this method is also disclosed.