Terminal Sidelink Reception Timing Adjustment for Adjacent-Band Interference
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Solution Overview
Problem
The challenge is to minimize or prevent inter-symbol interference (ISI) and inter-carrier interference (ICI) between independent sidelinks in wireless communication systems, particularly in V2X scenarios such as vehicle platooning, advanced driving, and remote driving, where direct communication between user equipment (UEs) is critical.
Innovation Solution
A method for adjusting reception timing points of sidelinks by estimating a difference value between reception timing points of adjacent frequency bands and determining a change in timing advance (TA) based on synchronization signals and predetermined thresholds, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reception timing points are fixed for sidelinks in adjacent frequency bands, then device complexity is reduced, but inter-symbol interference (ISI) and inter-carrier interference (ICI) occur between independent sidelinks
Solution Approach 1:
The patent changes the reception timing parameter dynamically by estimating the reception timing of sidelinks in adjacent frequency bands and adjusting the timing advance (TA) value accordingly. This allows the system to adapt timing parameters to prevent ISI and ICI while maintaining manageable device complexity through automated estimation and adjustment procedures.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal estimates reception timing based on synchronization signals from adjacent bands, calculates the difference from current timing, and adjusts the TA value accordingly. This closed-loop feedback ensures reliable communication by continuously optimizing timing alignment while managing device complexity through systematic adjustment rules.
2Reliability
If timing advance (TA) values are adjusted dynamically to prevent interference, then communication reliability improves, but processing time and system complexity increase
Solution Approach 1:
The patent performs preliminary timing estimation using synchronization signals before actual data transmission. By estimating the reception timing in advance based on sync signals from adjacent bands and calculating the required TA adjustment beforehand, the system minimizes timing adjustment delays during critical data transmission phases while ensuring reliable communication.
3Object-generated harmful factors
If reception timing points are adjusted based on adjacent band signals, then inter-symbol interference (ISI) is reduced, but measurement and detection difficulty increases
Solution Approach 1:
The patent uses synchronization signals as an intermediary to estimate reception timing. Instead of directly measuring complex interference patterns, the system leverages the structured synchronization signals from adjacent frequency bands as a mediator to infer timing information, thereby reducing ISI while simplifying the measurement and detection process through the use of these standardized reference signals.
Data Source
AI summary
Disclosed are a method by which a first user equipment (UE) changes a reception timing in a wireless communication system supporting side links, and an apparatus therefor, according to various embodiments. The method comprises the steps of: forming a first side link with a second UE in a first frequency band; estimating a second reception timing related to a second side link formed in a second frequency band, which is adjacent to the first frequency band, on the basis of a synchronization signal for a third UE using the second frequency band, and timing advance (TA) information; and determining whether to change a reception timing of a side link signal for the first side link on the basis of a difference value between a first reception timing related to the first side link and the second reception timing.