Joint Pattern Beam Sectorization for Massive MIMO CSI Feedback Reduction

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Solution Overview

Problem

Massive MIMO communication systems face challenges in reducing the amount of channel state information (CSI) feedback, which is excessive due to the large number of antennas and user equipment, leading to increased power consumption and complexity.

Innovation Solution

The joint pattern beam sectorization method divides the service target region into pattern sectors using antenna arrays with beamforming, reducing CSI feedback by employing beam division multiple access (BDMA) and joint space division and multiplexing (JSDM) technologies, and arranging antennas at specific intervals to generate pattern beam sectors with identical radiation patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If massive MIMO channel state information (CSI) feedback is estimated and transmitted for each user equipment, then beamforming can be performed for each UE in a wide service target region, but the amount of CSI feedback becomes excessively large

Engineering Contradiction:

Improvebeamforming capability for multiple UEsVSAvoidamount of CSI feedback

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The service target region is divided into multiple beam sectors, and each beam sector is further divided into multiple sub-sectors. This segmentation allows the system to manage CSI feedback in a structured manner, reducing the overall feedback requirement by organizing UEs into specific spatial groups rather than treating each UE independently across the entire service region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple beam sectors are merged into a unified structure where CSI feedback from multiple beam sectors can be aggregated and processed together. This merging approach allows the base station to efficiently handle CSI feedback from multiple UEs by combining their feedback signals in the beam sector domain, reducing the total feedback overhead compared to individual UE feedback processing.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If the number of beam sectors is increased to reduce CSI feedback, then spectral efficiency improves, but the system complexity increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts the number of beam sectors and sub-sectors based on the current service conditions and UE distribution. This dynamic configuration allows the system to optimize spectral efficiency while controlling complexity by only creating the necessary number of beam sectors and sub-sectors needed for current operations, rather than maintaining a fixed complex structure.

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If antennas are arranged at specific intervals to generate pattern beam sectors, then interference between neighboring sectors is prevented, but the antenna array occupies larger space

Engineering Contradiction:

Improveinterference between beam sectorsVSAvoidantenna array space

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

Different antenna arrays are assigned different radiation patterns with specific local characteristics. Each antenna array is configured with a unique pattern that is optimized for its specific beam sector, allowing the system to prevent interference between neighboring sectors through localized pattern differentiation rather than requiring large spatial separation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of preventing interference through spatial separation alone, the system uses pattern diversity in the radiation characteristic dimension. By assigning different radiation patterns to different antenna arrays, the system creates orthogonal or near-orthogonal beam sectors that do not interfere with each other, effectively using the pattern space dimension rather than only physical space.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 significantly reduces CSI feedback, improves channel capacity, and enhances spectral efficiency by preventing interference between neighboring pattern beam sectors, allowing for more efficient use of antenna resources.

Implementation Method 1

generating pattern beam sectors in the pattern sector through a beamforming using the antennas

Methodology Applied

Scientific EffectBeamforming:

Implementation Method 2

Each of the antennas may have an identical radiation pattern

Methodology Applied

Scientific EffectElectromagnetic radiation:

Data Source

PatentUS9894658B2Joint pattern beam sectorization method and apparatuses performing the same

Publication Date: 2018.02.13 KOREA ADVANCED INST OF SCI & TECH

AI summary

Provided is a joint pattern beam sectorization method and apparatuses for performing the same, wherein the joint pattern beam sectorization method including generating, in a service target region, a pattern sector corresponding to an antenna array including antennas having an identical radiation pattern by using the antenna array and generating pattern beam sectors in the pattern sector through a beamforming using the antennas.