LTE eNodeB Beam Coordination for CINR Gain

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In LTE networks employing beam forming technologies, adjacent eNodeBs experience interference due to overlapping downlink transmission beams, which limits the carrier-to-interference-and-noise ratio (CINR) gain at user equipment (UE), resulting in a suboptimal user experience.

Innovation Solution

Adjacent eNodeBs communicate beam forming parameters to each other, allowing them to adjust their downlink transmission beams to minimize interference, thereby increasing the CINR gain at UEs by optimizing the phase and amplitude of the beams.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If beam forming is deployed to improve signal quality, then signal directionality is improved, but interference between adjacent eNodeBs increases

Engineering Contradiction:

Improvesignal directionalityVSAvoidinterference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Adjacent eNodeBs exchange beam forming parameters (amplitude, phase, beam width, direction) through a feedback mechanism. Each eNodeB uses the received parameters from neighboring eNodeBs to adjust its own beam configuration, creating a coordinated feedback loop that reduces interference while maintaining signal directionality.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically changes beam forming parameters (amplitude, phase, beam width, direction) based on exchanged information from adjacent eNodeBs. By adjusting these parameters, eNodeBs can modify their beam patterns to reduce overlap and interference in boundary regions while preserving the directional signaling benefit.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If beam forming parameters are exchanged between adjacent eNodeBs to reduce interference, then CINR gain is improved, but network complexity increases

Engineering Contradiction:

ImproveCINR gainVSAvoidnetwork complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The interference management function is segmented and distributed to individual eNodeBs rather than being centralized. Each eNodeB independently processes received beam parameters and adjusts its own beams, eliminating the need for a complex centralized controller while achieving coordinated interference reduction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each eNodeB performs self-adjustment of its beam parameters based on information received from neighbors. The system enables self-service interference management where eNodeBs autonomously optimize their own transmissions using the exchanged parameters, reducing the need for complex external coordination mechanisms.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9282469B1Increasing CINR gain in a network deploying beam forming

Publication Date: 2016.03.08 T MOBILE INNOVATIONS LLC

AI summary

A method, system, and medium are provided for increasing carrier-to-interference-and-noise ratio (CINR) gain in a long-term-evolution network deploying beam forming (BF) technologies. Adjacent eNodeBs, each serving a respective user equipment (UE) located at the boundary between the two eNodeBs, communicate BF parameters to each other. Each eNodeB uses the received BF parameters to adjust its DL transmission beam in order to decrease the interference at each of the respective UEs. By adjusting the DL transmission beam to decrease interference, CINR gain at the UEs is correspondingly increased.