Timing Advance Adjustment for Crosslink Interference in Dynamic TDD
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Solution Overview
Problem
In 5G communication systems, especially in dynamic TDD systems, timing misalignment between desired and interference signals leads to inter-carrier interference, deteriorating overall system performance and requiring effective interference cancellation techniques.
Innovation Solution
A method and apparatus for timing adjustment/alignment in wireless communication systems, where timing advance (TA) information related to interference is received and applied to adjust uplink data transmission, enabling alignment between desired and interference signals, and additional timing advance values are calculated to ensure cyclic prefix overlap, thereby mitigating crosslink interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is applied to improve frequency efficiency and system performance, then data transmission flexibility is improved, but timing misalignment between desired and interference signals occurs causing inter-carrier interference
Solution Approach 1:
The base station performs preliminary timing advance calculations and determines interference TA values before uplink transmission occurs. The base station pre-calculates the timing advance value based on downlink timing and path loss, then provides this information to the terminal in advance through downlink control information, enabling the terminal to adjust its uplink transmission timing proactively to avoid inter-carrier interference
Solution Approach 2:
The invention changes the timing parameter of uplink transmission by applying a calculated timing advance value. The base station determines a specific TA value based on the difference between downlink timing and uplink timing, and the terminal adjusts its transmission timing by this amount, effectively changing the timing parameter to achieve alignment between desired and interference signals
2Manufacturing precision
If timing advance information is applied to adjust uplink transmission timing, then timing alignment between desired and interference signals is improved, but system complexity increases due to additional calculations and signaling
Solution Approach 1:
The base station autonomously calculates the timing advance value based on its own downlink timing and the terminal's path loss information. The calculation uses readily available parameters (downlink timing, path loss) that the base station already possesses, enabling self-service timing adjustment without requiring complex coordination with other base stations or additional measurement infrastructure
Solution Approach 2:
The timing advance value acts as an intermediary parameter that bridges the gap between downlink timing and uplink timing. Instead of directly coordinating complex timing relationships between multiple base stations and terminals, the invention uses this intermediate TA value to simplify the timing alignment process, reducing system complexity while achieving the desired timing alignment
3Object-affected harmful factors
If clustering technique is used to tie base stations together with same UL/DL configuration, then interference between terminals is reduced, but overall system performance deteriorates due to loss of flexibility
Solution Approach 1:
The invention segments the timing adjustment into two parts: a common timing advance for all terminals in a cluster (to handle baseline interference) and an additional interference-specific timing advance (to handle dynamic interference scenarios). This segmentation allows different timing strategies to be applied to different interference scenarios, maintaining both interference reduction and system flexibility
Solution Approach 2:
The invention introduces dynamic timing adjustment capability where the base station can calculate and apply different timing advance values based on real-time transmission directions and interference conditions. Instead of using a fixed UL/DL configuration for all base stations in a cluster, the system dynamically adjusts timing parameters to adapt to changing traffic patterns and interference scenarios, thereby improving overall system performance
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). An embodiment of the present disclosure relates to a method for operating a terminal, which includes receiving timing advance (TA) information related to an interference, determining whether to apply the TA information related to the interference, and transmitting uplink data based on the TA information related to the interference, and the terminal performing the same. Further, the present disclosure relates to a method and an apparatus for operating a base station operating with the terminal.