Time Advance Granularity Adjustment for Multi-Numerology Wireless Networks
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Solution Overview
Problem
The fixed time advance adjustment configuration used in wireless networks supporting single numerology operations, such as LTE and GSM, is not suitable for networks supporting multiple numerology operations like NR, as it leads to inaccuracy and instability in timing advance management due to differences in subcarrier spacing and cyclic prefix length.
Innovation Solution
A method for determining a time advance (TA) value and granularity based on the numerology used by terminal devices, which involves updating previous TA values and calculating compensation based on new TA commands and granularities, allowing for flexible TA adjustment in networks with multiple numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed TA adjustment configuration is used in networks supporting single numerology operation, then the TA management is simple, but the timing accuracy and stability deteriorate in networks supporting multiple numerologies
Solution Approach 1:
The patent applies dynamics by making the TA granularity configurable based on the numerology being used. Instead of a fixed TA adjustment configuration, the system dynamically adjusts the TA granularity according to the active numerology (subcarrier spacing and cyclic prefix length), allowing the TA management to adapt to different operating conditions while maintaining simplicity through automated configuration.
Solution Approach 2:
The patent changes the TA granularity parameter based on the numerology configuration. When the network supports multiple numerologies, the TA granularity is adjusted according to the subcarrier spacing and cyclic prefix length of the active numerology, thereby improving timing accuracy without requiring complex manual management.
2Ease of operation
If a fixed TA adjustment configuration is used, then the system is easy to operate, but the timing stability worsens when switching between different numerologies
Solution Approach 1:
The system dynamically adjusts TA granularity based on the active numerology, automatically adapting when switching between different numerologies. This maintains timing stability without requiring manual reconfiguration, as the system self-adjusts the TA parameters according to the current operating mode.
Solution Approach 2:
The patent implements self-service by enabling the system to automatically configure and adjust TA granularity based on the active numerology. The network device or terminal device autonomously determines the appropriate TA granularity without external intervention, maintaining both ease of operation and timing stability during numerology switching.
3Device complexity
If TA granularity is fixed, then the configuration is simple, but the adaptability to different numerologies deteriorates
Solution Approach 1:
The patent changes the TA granularity parameter according to the numerology being used. The system supports multiple numerologies by adjusting the TA granularity to match the subcarrier spacing and cyclic prefix length of the active numerology, thereby achieving versatile adaptability without significantly increasing configuration complexity.
Solution Approach 2:
The patent achieves universality by creating a TA adjustment mechanism that works across multiple numerologies. A single TA management system can handle different subcarrier spacings and cyclic prefix lengths by dynamically configuring the appropriate granularity, making the system universally applicable to various numerology configurations.
Data Source
AI summary
Methods, network device and terminal device are disclosed time advance adjustment. A method comprises receiving a time advance, TA, command from a network device; determining a TA granularity or range; and determining a TA value based at least partly on the TA command and the TA granularity or range, wherein different numerologies are configured for at least two carriers and/or at least two bandwidth parts (BWPs) in one carrier, wherein the at least two carriers and/or the at least two BWPs serve the terminal device and/or the terminal device supports at least one numerology.