Wireless Device Cell Reselection Mobility State Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing cell reselection based on mobility states, particularly in determining the optimal time for reselection and adjusting parameters like hysteresis values and cell reselection timers, which can lead to suboptimal network performance due to the lack of consideration for the time interval and frequency of cell reselections.
Innovation Solution
A method and apparatus for a wireless device to perform cell reselection by receiving information on time ranges and weights related to these ranges, incrementing a mobility counter based on the time interval since the last cell reselection, and determining its mobility state to adjust hysteresis values and cell reselection timers accordingly, enabling quicker and more accurate next cell reselections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is performed frequently to maintain optimal service quality, then service quality is improved, but network latency and overhead increase
Solution Approach 1:
The patent implements dynamic cell reselection by adjusting the mobility state estimation based on time-range weighted mobility counters. The system dynamically adapts the mobility state (low, medium, high) according to the device's actual movement pattern, allowing the reselection behavior to be flexible and responsive to changing conditions rather than static, thereby optimizing both service quality and latency
Solution Approach 2:
The system changes key parameters (hysteresis values and cell reselection timers) based on the determined mobility state. When high mobility is detected, the system adjusts these parameters to enable faster reselection, directly addressing the latency issue while maintaining service quality through state-appropriate parameter configurations
2Loss of time
If cell reselection parameters are adjusted aggressively to reduce latency, then response time is improved, but service quality and stability deteriorate
Solution Approach 1:
The system dynamically adjusts parameters based on the determined mobility state rather than using fixed aggressive settings. The mobility state estimation mechanism allows the system to respond appropriately to actual device movement, adjusting parameters only when necessary and to the appropriate degree, thus improving response time without sacrificing service quality
Solution Approach 2:
The system uses feedback from the mobility state estimation process to continuously adjust cell reselection parameters. The mobility counter and time-range weighting provide feedback about actual device movement patterns, enabling the system to fine-tune parameters like hysteresis and timers to achieve optimal balance between response time and service quality
3Device complexity
If mobility state estimation uses simple counting methods, then computational complexity is reduced, but measurement precision of mobility state deteriorates
Solution Approach 1:
The patent segments the mobility measurement into time-range weighted components rather than using a single uniform counter. By dividing the mobility assessment into different time ranges with different weights, the system achieves more precise mobility state estimation while keeping the computational approach modular and manageable
Solution Approach 2:
The system introduces time-range weighting parameters to enhance the precision of mobility state estimation. By applying different weights to mobility events occurring in different time ranges, the system achieves more accurate mobility characterization without requiring complex computational algorithms
Data Source
AI summary
The present disclosure relates to method and apparatus for cell reselection in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device in a wireless communication system comprises performing a cell reselection to a cell at a first time point during a time duration; receiving, from the cell, information comprising a first time range and a weight related to the first time range; determining a mobility counter based on the weight related to the first time range, wherein a time length between the first time point and a second time point at which a previous cell reselection is performed during the time duration is within the first time range; and determining a mobility state of the wireless device based on the mobility counter.