Uplink Timing Advance Configuration for Wireless Synchronization
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in adjusting uplink synchronization and determining timing advance (TA) values, particularly in next-generation radio access technologies like NR, which affect communication capacity, reliability, and latency.
Innovation Solution
The method involves configuring the basic unit of the TA value based on subcarrier spacing, frequency band, RACH numerologies, default numerology of data channels, and system information to efficiently manage uplink synchronization, allowing for more precise timing adjustments in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional timing advance adjustment methods are used in next-generation wireless systems, then device compatibility is maintained, but uplink synchronization precision deteriorates due to insufficient timing resolution for diverse numerologies
Solution Approach 1:
The patent makes the basic unit of timing advance dynamic by linking it to the subcarrier spacing of the uplink channel. Instead of using a fixed basic unit, the system adapts the timing advance resolution to match the numerology being used, allowing for precise timing adjustment in high-frequency bands with large subcarrier spacing while maintaining compatibility with legacy systems.
Solution Approach 2:
The patent changes the parameter of timing advance basic unit from a fixed value to a variable that depends on subcarrier spacing. This allows the system to optimize timing resolution according to the operating conditions, particularly for FR2 and above where larger subcarrier spacing requires coarser timing steps to achieve appropriate synchronization precision.
2Measurement precision
If fixed basic unit timing advance is used, then system simplicity is maintained, but uplink synchronization accuracy deteriorates in high frequency bands with large subcarrier spacing
Solution Approach 1:
The patent performs preliminary configuration of the timing advance basic unit based on the subcarrier spacing before actual timing adjustment is needed. By pre-determining the appropriate basic unit according to the uplink channel's numerology, the system avoids calculation delays during real-time synchronization adjustments and ensures accurate timing alignment is immediately available when needed.
3Reliability
If timing advance is adjusted frequently to maintain synchronization, then uplink synchronization is improved, but signaling overhead and processing latency increase
Solution Approach 1:
The patent enables the timing advance mechanism to serve itself by automatically selecting the appropriate basic unit based on the subcarrier spacing without requiring external configuration or complex control logic. This self-adapting mechanism maintains reliable synchronization while minimizing signaling overhead, as the system autonomously optimizes its behavior according to the active numerology.
Data Source
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AI summary
A method for allowing a user equipment (UE) and a base station (BS) to transmit and receive uplink (UL) signals in a wireless communication system is disclosed.