Dynamic TDD Interference Mitigation via Link Direction Detection

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Solution Overview

Problem

Dynamic Time Division Duplex (TDD) systems face challenges in interference mitigation due to flexible subframes that can change transmission directions, leading to unforeseen interference from neighboring base stations and user equipment, which current mechanisms cannot effectively address.

Innovation Solution

A method for user equipment and radio network nodes to obtain link direction information and transmission parameters associated with neighboring base stations or user equipment, allowing for interference mitigation based on these parameters, enabling the determination of transmission directions and reconstruction of interference signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If dynamic TDD configures flexible subframes to match instantaneous traffic, then resource utilization and user experience are improved, but interference mitigation becomes difficult due to unpredictable transmission directions

Engineering Contradiction:

Improveresource utilizationVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary actions by obtaining link direction information and transmission parameters from neighboring base stations before interference occurs. This enables the user equipment to prepare interference mitigation strategies in advance, reconstructing potential interference signals based on predicted transmission directions, thereby resolving the contradiction between flexible resource allocation and interference mitigation.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If flexible subframes are configured dynamically, then adaptability to traffic conditions is improved, but current interference mitigation mechanisms become insufficient

Engineering Contradiction:

ImproveflexibilityVSAvoidinterference mitigation effectiveness

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies dynamics by making the interference mitigation mechanism adaptive to changing transmission directions. The system dynamically adjusts its behavior based on obtained link direction information, switching between different mitigation strategies depending on whether neighboring subframes are configured for uplink or downlink transmission, thus maintaining reliability while preserving flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback mechanisms by continuously obtaining link direction information and transmission parameters from neighboring base stations. This feedback loop enables real-time adjustment of interference mitigation strategies, allowing the system to respond to dynamic traffic conditions while maintaining effective interference cancellation.

Inventive Principle:

Principle #23Feedback

3Reliability

If the same TDD configuration is used in all cells, then interference mitigation mechanisms work effectively, but resource allocation cannot be optimized for individual cell traffic patterns

Engineering Contradiction:

Improveinterference mitigationVSAvoidresource allocation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies local quality by enabling cell-specific optimization of TDD configurations. Each cell can independently configure its flexible subframes based on local traffic patterns while the system obtains link direction information from neighboring cells to manage interference. This allows resource allocation efficiency to be optimized for each cell's specific conditions without compromising interference mitigation effectiveness.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3033915B1Methods, user equipment and radio network node for interference mitigation in a dynamic time division duplex system

Publication Date: 2019.11.27 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

The present disclosure relates to methods, a user equipment and a radio network node for interference mitigation in a dynamic TDD system comprising a user equipment (201, 700), a serving base station (202) serving the user equipment (201, 700), at least one neighboring base station (203) and at least one neighboring user equipment (204) served by the at least neighboring base station (203). The method comprises obtaining (S301) link direction information and at least one transmission parameter, wherein the link direction information and the at least one transmission parameter are associated with downlink transmission of the at least one neighboring base station (203) or uplink transmission of the at least one neighboring user equipment (204). The method further comprises mitigating (S302) interference caused by the downlink transmission or uplink transmission based upon the link direction information and the at least one transmission parameter. The methods, user equipment and radio network node of the present disclosure may overcome or alleviate the interference issues in the dynamic TDD system and give quality and efficiency of the wireless communication a big boost.