Cell Re-Selection Using Wake-Up Signal Assistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
5G devices face significant energy efficiency challenges due to frequent recharging needs, especially for UEs with small batteries, and existing cell re-selection methods do not effectively utilize wake-up signals (WUS) to reduce power consumption.
Innovation Solution
UEs receive cell re-selection information and assistance information indicating frequencies or neighbor cells supporting WUS, enabling them to perform evaluations and prioritize cell re-selection based on WUS availability, thereby reducing power consumption while maintaining low latency and mobility performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE performs frequent cell re-selection to maintain optimal communication quality, then communication reliability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The network performs preliminary actions by pre-configuring cell re-selection parameters and providing advance information about wake-up signal availability in neighbor cells before the UE actually needs to perform cell re-selection. This allows the UE to make more informed decisions about when to activate the radio, reducing unnecessary power consumption while maintaining communication reliability.
Solution Approach 2:
The system implements feedback mechanisms where the network provides assistance information to the UE about wake-up signal availability in candidate cells. This feedback loop allows the UE to adjust its cell re-selection behavior based on real-time network conditions, balancing communication quality with power savings.
2Adaptability or versatility
If UE activates radio frequently to monitor cell re-selection options, then mobility performance is improved, but energy efficiency deteriorates
Solution Approach 1:
Instead of continuous radio activation, the system implements periodic wake-up cycles where the UE monitors for wake-up signals at predetermined intervals. The network configures these periodic monitoring patterns and provides advance information about which cells are likely to have wake-up signals, allowing the UE to synchronize its periodic checks with actual network activity patterns, thereby reducing overall energy consumption while maintaining mobility performance.
Solution Approach 2:
The UE performs self-service by autonomously evaluating cell re-selection options based on the assistance information provided by the network. The UE independently determines when to activate the radio and which cells to monitor, using the pre-provided information about wake-up signal availability to make intelligent decisions without requiring continuous network control, thus improving energy efficiency while maintaining adaptability.
3Measurement precision
If network provides detailed cell re-selection information to UE, then cell re-selection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The network applies local quality by providing cell re-selection assistance information selectively and differentiated by location. Instead of broadcasting comprehensive cell details to all UEs, the network provides targeted information about wake-up signal availability in specific neighbor cells based on local network configuration and UE capabilities. This localized approach ensures high re-selection accuracy for relevant cells while minimizing unnecessary signaling overhead for cells where wake-up signals are not available.
Data Source
AI summary
Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media for cell re-selection enhancements. A first device receives, from a second device providing a source cell, cell re-selection information indicating a set of candidate cells or candidate frequencies for cell re-selection. The first device receives, from the second device, assistance information for cell re-selection indicating at least one frequency or at least one neighbor cell applying a wake-up signal (WU'S), and the set of candidate cells or candidate frequencies comprises at least one neighbor cell or the at least one frequency. The first device performs, based on the cell re-selection information and the assistance information, a cell re-selection evaluation on at least a part of the set of candidate cells or candidate frequencies. In this way. UE supporting WUS can prioritize cells or frequencies that apply WUS, thus energy efficiency can be improved.