Uplink Timing Adjustment for Multi-Subcarrier Spacing in NR Systems
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Solution Overview
Problem
Current mobile communication systems, particularly OFDM-based systems, face challenges in synchronizing uplink transmissions with multiple subcarrier spacings, which complicates timing adjustments and affects communication efficiency in Next Radio (NR) systems.
Innovation Solution
A method and apparatus for adjusting uplink transmission timing in OFDM-based mobile communication systems with multiple subcarrier spacings, involving UE receiving system information and Timing Advance Commands from the base station to determine and adjust transmission timing based on subcarrier spacing and Timing Advance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple subcarrier spacings are supported in NR system to meet various QoS requirements, then system adaptability and QoS support are improved, but uplink timing synchronization complexity and difficulty increase
Solution Approach 1:
The patent segments the timing adjustment process by introducing separate timing advance parameters for different subcarrier spacings (e.g., N_TA,offset for 15 kHz and N_TA,offset' for 30 kHz). This allows independent timing control for each subcarrier spacing, resolving the contradiction by making the system adaptable to multiple spacings while managing complexity through structured parameter separation.
Solution Approach 2:
The patent changes timing parameters dynamically based on subcarrier spacing. By defining different offset parameters (N_TA,offset and N_TA,offset') for different subcarrier spacings and selecting appropriate parameters based on the active subcarrier spacing, the system achieves adaptability while maintaining manageable complexity through parameter selection rather than complex calculations.
2Measurement precision
If timing advance parameters are defined for each subcarrier spacing to enable precise timing adjustment, then timing precision is improved, but system complexity and information overhead increase
Solution Approach 1:
The patent implements dynamic parameter selection where the appropriate timing offset (N_TA,offset or N_TA,offset') is chosen based on the active subcarrier spacing. This dynamic approach maintains high timing precision for each specific subcarrier spacing while avoiding the need to manage all parameters simultaneously, thus reducing overall system complexity.
Solution Approach 2:
Different timing offset parameters are defined for different subcarrier spacings (15 kHz uses N_TA,offset, 30 kHz uses N_TA,offset'). The system changes the active parameter based on the subcarrier spacing configuration, achieving precise timing adjustment for each case while managing complexity through conditional parameter selection rather than universal complex parameter sets.
3Manufacturing precision
If separate timing advance parameters are introduced for different subcarrier spacings, then timing adjustment accuracy is improved, but signaling overhead and processing burden increase
Solution Approach 1:
The timing advance parameters are segmented by subcarrier spacing type. Instead of using one complex parameter set for all subcarrier spacings, the patent divides parameters into specific groups (N_TA,offset for 15 kHz, N_TA,offset' for 30 kHz), reducing the effective parameter quantity needed at any given time while maintaining high adjustment accuracy for each segment.
Solution Approach 2:
The system dynamically selects which timing parameter to use based on the active subcarrier spacing. This dynamic selection reduces the effective parameter quantity that needs to be managed and signaled at any moment, while still providing accurate timing adjustment capability across different subcarrier spacings when needed.
Data Source
AI summary
Data transfer method and apparatus for use in a mobile communication system are provided. Method to adjust uplink transmission timing includes receiving system information from a base station, receiving RRC message from the base station, receiving Timing Advance Command from the base station, determining N_TA and TAG for uplink timing adjustment and adjusting uplink transmission timing of the TAG according to N_TA.