Adaptive Numerology for High Speed Train 5G Connectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed train networks face challenges in providing efficient network connectivity due to rapidly changing channel conditions caused by high user mobility, leading to issues with delay spread and Doppler spread, which affect signal integrity and spectral efficiency in 5G communications.
Innovation Solution
Adaptive resource management using a scaled numerology family and adaptable cyclic prefix length is implemented to adjust subcarrier spacing and cyclic prefix ratios based on the user equipment's location and speed, mitigating the effects of Doppler and delay spread by dynamically switching between different numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed numerology is used for 5G communications, then device complexity is reduced and ease of operation is improved, but signal integrity deteriorates under high mobility conditions due to Doppler spread and delay spread
Solution Approach 1:
The patent implements dynamic numerology adaptation where the network device switches between different numerologies (subcarrier spacing and cyclic prefix combinations) based on the user equipment's mobility state. When high mobility is detected, a first numerology with larger subcarrier spacing and adjusted cyclic prefix is applied; when low mobility is detected, a second numerology with smaller subcarrier spacing is used. This dynamic adjustment resolves the contradiction by adapting signal parameters to match channel conditions, maintaining signal integrity without requiring permanently complex resource management structures.
Solution Approach 2:
The patent changes key transmission parameters (subcarrier spacing and cyclic prefix length) based on detected mobility conditions. By adjusting these parameters dynamically, the system optimizes signal integrity for high-speed train scenarios while avoiding the need for permanently complex resource management configurations. The parameter changes are triggered by mobility detection and applied selectively to affected user equipment.
2Productivity
If adaptive resource management with scaled numerology family is implemented, then signal integrity and spectral efficiency are improved under varying channel conditions, but device complexity increases due to multiple numerology configurations
Solution Approach 1:
The patent segments the resource management approach by creating a scaled numerology family with discrete, standardized configurations. Instead of allowing continuous parameter adjustment, the system defines specific numerology options (different subcarrier spacing and cyclic prefix combinations) that can be selectively applied. This segmentation reduces complexity by providing a finite set of pre-defined configurations while still enabling adaptation to different spectral efficiency requirements through selective application of appropriate numerologies.
Solution Approach 2:
The patent implements controlled parameter changes by selecting from a scaled numerology family with specific subcarrier spacing values and cyclic prefix ratios. The network device changes parameters based on channel conditions and mobility detection, but only within the defined numerology family. This approach improves spectral efficiency under varying conditions while limiting complexity growth by constraining parameter changes to a standardized set of configurations rather than arbitrary adjustments.
3Reliability
If cyclic prefix length is adapted based on user location, then resistance to delay spread is improved, but use of energy increases due to dynamic resource reconfiguration
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple cyclic prefix lengths corresponding to different user locations relative to base stations. When a user equipment enters a high-mobility region (between base stations), the network device proactively switches to an extended cyclic prefix configuration before delay spread becomes problematic. This preliminary adaptation prevents signal degradation rather than reacting to it, reducing the need for energy-intensive retransmissions and continuous parameter optimization.
Solution Approach 2:
The patent applies local quality by configuring different cyclic prefix lengths based on the user equipment's specific location and mobility state. Users in high-mobility regions between base stations receive extended cyclic prefixes for delay spread resistance, while users in stable regions use normal cyclic prefixes to conserve energy. This localized adaptation ensures that energy-consuming extended cyclic prefixes are applied only where necessary to combat delay spread, optimizing the balance between reliability and energy consumption.
Data Source
AI summary
The present disclosure provides for adaptive resource management in new radio operations that adapts a numerology including a subcarrier spacing and/or cyclic prefix for a user equipment (UE) traveling at a high speed. A base station may transmit via a plurality of remote radio heads (RRH) to a user equipment (UE) is moving along a high speed track. The base station may transmit, in a first time period, using a first numerology including a first subcarrier spacing and a first cyclic prefix ratio, a first transmission for the UE. The base station may transmit, in a subsequent time period, using a second numerology including a second subcarrier spacing and a second cyclic prefix ratio, a second transmission for the UE. At least one of the second subcarrier spacing is different than the first subcarrier spacing or the second cyclic prefix ratio is different than the first cyclic prefix ratio.