Wireless Beam Alignment with Optical Polarization Feedback
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Solution Overview
Problem
Existing beam alignment methods in wireless communication systems, particularly in systems utilizing pencil beams, face inefficiencies in resource utilization and increased time requirements due to the need for extensive time resources and handshaking between transmitting and receiving sides, and suffer from accuracy issues due to polarization distortion in optical beams.
Innovation Solution
A method is proposed that aligns beams using optical beams with both homogeneous and inhomogeneous patterns, utilizing feedback information to determine and compensate for distortion, thereby reducing resource requirements and improving alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam alignment is performed using the index of the synchronization signal block (SSB), then beam alignment can be achieved, but time resources equal to the number of beams must be utilized causing excessive time requirements and poor resource utilization
Solution Approach 1:
The patent segments the beam alignment process into two distinct stages: a first beam alignment using SSB index (coarse alignment) and a second beam alignment using optical beam characteristics (fine alignment). This segmentation allows the system to first quickly establish a rough beam direction using traditional methods, then refine the alignment using optical beam properties, thereby reducing the total time required while maintaining accuracy.
Solution Approach 2:
The patent performs preliminary beam alignment using SSB index before conducting the final optical beam alignment. This preliminary action establishes an initial beam direction that narrows down the search space for the subsequent optical alignment, preventing the system from having to search through all possible beams from scratch and thus reducing the overall time required.
2Measurement precision
If Multi-stage Beam Search method is performed in the order of broad beam to narrow beam, then beam alignment can be achieved, but delay occurs due to hand shaking between transmitting and receiving sides
Solution Approach 1:
The patent enables the receiving side to independently determine optical beam characteristics (such as polarization state) from received signals and feed back this information to the transmitting side. This self-service capability eliminates the need for repeated handshaking between transmit and receive sides, as each side can autonomously process and act on the information, thereby reducing delay while maintaining alignment accuracy.
3Productivity
If beam alignment is performed based on an optical beam with inhomogeneous polarization characteristics, then alignment speed can be improved, but polarization distortion occurs due to pressure, temperature change, curvature, and medium inhomogeneity
Solution Approach 1:
The patent implements a feedback mechanism where the receiving side measures the polarization state of the optical beam and feeds back this information to the transmitting side. The transmitting side then uses this feedback to adjust and compensate for polarization distortion, ensuring that the alignment accuracy is maintained despite the use of inhomogeneous polarization beams that enable faster alignment.
Solution Approach 2:
The patent dynamically adjusts polarization compensation parameters based on the measured polarization state. By changing the compensation parameters in response to environmental conditions (pressure, temperature, curvature), the system maintains accurate beam alignment even when using inhomogeneous polarization beams that provide faster alignment speed.
4Adaptability or versatility
If a large number of beams exist within a single cell in pencil beam systems, then coverage and capacity are improved, but resource utilization deteriorates due to the need for extensive time resources for beam alignment
Solution Approach 1:
The patent segments the beam alignment process into two stages, allowing the system to handle a large number of beams more efficiently. The first stage using SSB index provides a coarse grid for quick initial alignment, while the second stage using optical beam characteristics provides fine-grained alignment. This segmentation enables the system to manage numerous beams without proportionally increasing the time required for alignment.
Solution Approach 2:
The patent performs preliminary beam alignment using SSB index to establish a rough direction before conducting detailed optical alignment. This preliminary action significantly reduces the search space for subsequent alignment operations, enabling the system to efficiently handle a large number of beams by avoiding exhaustive searches and thus improving resource utilization.
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
This approach reduces the physical resources and time needed for beam alignment, while enhancing alignment accuracy by compensating for polarization distortion.
Implementation Method 1
the optical beam may be distorted and received. For example, polarization mode distortion (PMD) may occur. The PMD occurs due to pressure applied to the optical fiber, temperature change, curvature, and inhomogeneity of the medium.
Data Source
AI summary
A method performed by means of a first wireless device in a wireless communication system, according to one embodiment of the present specification, comprises the steps of: transmitting, to a second wireless device, a first signal to which a first specific beam is applied; transmitting, to the second wireless device, a second signal to which a second specific beam is applied; receiving, from the second wireless device, feedback information generated on the basis of the first signal and the second signal; and determining, on the basis of the feedback information, a beam related to the second wireless device.