TDD Radio Base Station Interference Estimation

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Solution Overview

Problem

In the LTE-A system, dynamic or semi-static changes in downlink and uplink transmission ratios between neighboring radio base stations lead to interference between uplink and downlink signals, degrading communication quality, necessitating effective interference level estimation between neighboring transmitting/receiving points.

Innovation Solution

A radio base station and user terminal equipped with interference estimation resources and methods to receive and estimate interference levels from neighboring stations, using time division duplexing (TDD) to identify and mitigate interference by adjusting configurations and transmission powers based on reported interference estimation resource information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If different DL/UL configurations are applied between neighboring transmitting/receiving points to increase transmission flexibility, then adaptability is improved, but interference between uplink and downlink signals increases

Engineering Contradiction:

ImproveDL/UL configuration flexibilityVSAvoidinterference level

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the receiving point measures interference levels on uplink or downlink signals and feeds back interference estimation information to the transmitting point. This feedback enables the transmitting point to adjust its DL/UL configuration or transmission power to reduce interference, thus resolving the contradiction between configuration flexibility and interference control

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the parameter of DL/UL configuration dynamically based on interference conditions. By adjusting the DL/UL configuration parameter according to measured interference levels and feedback information, the system can adapt to different scenarios while controlling interference, thus resolving the contradiction between adaptability and harmful interference

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If interference estimation resources are allocated to measure interference levels, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improveinterference level measurement accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent makes the receiving point perform multiple functions: it serves as both a normal communication receiver and an interference measurement device. By utilizing the existing receiving capability to measure interference levels on uplink or downlink signals, the system achieves precise interference estimation without adding dedicated measurement devices, thus resolving the contradiction between measurement precision and device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10375584B2Radio base station, user terminal, radio communication system and interference estimation method

Publication Date: 2019.08.06 NTT DOCOMO INC

AI summary

A radio base station is disclosed that receives an uplink signal using a time division duplexing (TDD) scheme, including an estimation section that estimates an interference level that the uplink signal receives in a plurality of subframes of which a downlink/uplink configuration differs among cells and a transmission section that transmits information about the interference level. The information about the interference level comprises interference levels about the plurality of subframes.