Cell Reselection Priority Adjustment for Mobility States
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High frequency bands used in 5G communication systems are not suitable for terminals moving at high speeds, necessitating a method to adjust frequency priorities based on the terminal's mobility state to ensure efficient service reception.
Innovation Solution
A method for performing cell reselection in wireless communication systems that involves receiving and measuring mobility state information, adjusting frequency priorities based on the terminal's mobility state, and performing cell reselection procedures accordingly, with higher frequencies prioritized for slower moving speeds and lower frequencies for higher speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high frequency bands are used for capacity enhancement in small cells, then network capacity is improved, but service reception reliability deteriorates for terminals moving at high speeds
Solution Approach 1:
The patent implements dynamic frequency priority adjustment based on terminal mobility state. The network determines whether a terminal is in high-speed or low-speed state and dynamically adjusts the priority of high frequency bands accordingly. For high-speed terminals, high frequency band priority is reduced or disabled; for low-speed terminals, high frequency band priority is maintained or increased. This dynamic adaptation resolves the contradiction by making network capacity optimization conditional on terminal mobility characteristics.
Solution Approach 2:
The patent changes the parameter of frequency band priority based on terminal mobility state. The network configures different priority values for high frequency bands depending on whether the terminal is moving at high or low speed. This parameter change allows the system to maintain high network capacity for stationary or slow-moving terminals while ensuring reliable service reception for high-speed terminals by using lower frequency bands with better propagation characteristics.
2Productivity
If frequency priorities are adjusted based on mobility state, then service reception efficiency is improved for high-speed terminals, but system complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the terminal autonomously determines its own mobility state based on measurement information such as reference signal received power (RSRP) changes over time. The terminal compares its measured mobility state against threshold values to determine whether it is in a high-speed or low-speed state, and autonomously adjusts its cell reselection behavior accordingly. This self-determination approach improves service reception efficiency without requiring complex network-side mobility detection and control mechanisms.
Solution Approach 2:
The patent employs feedback mechanisms where the network provides threshold configuration information to the terminal, and the terminal uses this feedback to determine its mobility state. The network may also receive mobility state information from the terminal and adjust network-side parameters accordingly. This feedback loop enables efficient service reception for high-speed terminals while maintaining manageable system complexity through structured information exchange between network and terminal.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for a terminal to perform a cell re-selection procedure and a device supporting the method are disclosed. The method comprises: a step of receiving mobility state information indicating a mobility state of a terminal most suitable for each frequency; a step of measuring the mobility state of the terminal; a step of adjusting priorities by assuming, based on the mobility state information, that the frequency most suitable for the measured mobility state has highest priority; and a step of performing a cell re-selection procedure on the basis of the adjusted priorities.