RIS Beam Sweeping Pattern Control for Faster Wireless Synchronization
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Solution Overview
Problem
Existing beam sweeping methods in wireless communication systems using reconfigurable intelligent surfaces (RIS) face inefficiencies in terms of complexity, accuracy, and delayed time, particularly when beamforming is performed.
Innovation Solution
A method and apparatus for performing synchronization and beam sweeping between a base station and a terminal using a RIS pattern, involving generating slots with symbols and synchronization signals, transmitting these through beams, measuring beam results, determining an optimal RIS pattern, and controlling the RIS to enhance signal transmission and reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam sweeping is performed using conventional methods in wireless communication systems, then signal transmission can be achieved, but the complexity of the system increases and accuracy decreases
Solution Approach 1:
The patent introduces a reconfigurable intelligent surface (RIS) as an intermediary component between the base station and terminal. The RIS reflects and directs signals to improve beam sweeping accuracy by providing additional signal paths and enabling precise beam direction control through programmable reflection elements, thereby resolving the contradiction between accuracy and complexity.
Solution Approach 2:
The patent dynamically changes the reflection parameters of the RIS elements to optimize beam sweeping performance. By adjusting the phase and amplitude parameters of individual RIS elements, the system achieves higher measurement precision in beam direction while managing system complexity through parameter optimization rather than structural complexity.
2Loss of time
If beam sweeping is performed using conventional methods, then signal transmission can be achieved, but the time required for synchronization and beam alignment increases
Solution Approach 1:
The patent implements preliminary beam alignment using the RIS by pre-configuring reflection patterns before actual data transmission. The base station performs initial synchronization and beam sweeping through the RIS to establish optimal beam directions in advance, reducing the time required for subsequent communications while maintaining reliable signal transmission.
Solution Approach 2:
The patent maintains continuous beam alignment by dynamically adjusting RIS reflection patterns during communication. The system continuously optimizes beam directions through real-time RIS reconfiguration, ensuring uninterrupted signal transmission and reducing synchronization delays while maintaining high reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Optimizes beam sweeping operations by improving complexity, accuracy, and reducing latency through controlled RIS patterns, enabling effective signal transmission and reception even in obstructed environments.
Implementation Method 1
transmitting, to the UE, the at least one slot including the synchronization signal through one or more beams formed according to a first RIS pattern
Implementation Method 2
beamforming and massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, and multiantenna transmission technologies
Data Source
AI summary
Methods and apparatuses are provided in which a slot is generated including a symbol and a synchronization signal, which is transmitted through the symbol. The slot is transmitted to a reconfigurable intelligent surface (RIS) and a user equipment (UE). The symbol is used to determine an operation to be performed by the UE during a predetermined time period including the slot. The slot is transmitted to the UE through beams formed according to a first RIS pattern. A result of measuring each beam based on the beams is received from the UE. A second RIS pattern is determined for transmitting data based on the result of measuring each beam. A signal for controlling the first RIS pattern based on the second RIS pattern is transmitted to the RIS. A data signal is transmitted to the UE through the RIS. The second RIS pattern is applied to the RIS.