TDD Base Station Uplink Configuration for FDD Interference Mitigation

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Solution Overview

Problem

Severe interference occurs between Time Division Duplex (TDD) and Frequency Division Duplex (FDD) wireless networks, particularly between mobile devices, leading to performance degradation, especially in indoor environments where devices operate concurrently or at cell edges, causing prolonged service disruptions.

Innovation Solution

A system and method for detecting interference between TDD and FDD networks by processing quality-indicator reports from TDD mobile stations to adjust uplink configurations of base stations, avoiding interference by scheduling data packet reception during interference-free time intervals or using alternative frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If TDD and FDD networks are deployed concurrently in adjacent frequency bands, then spectrum utilization is improved, but severe interference occurs between mobile devices of the two networks

Engineering Contradiction:

Improvespectrum utilizationVSAvoidinterference between TDD MS and FDD UE

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary detection and coordination mechanism between TDD and FDD networks. Base stations detect interference conditions and coordinate with neighboring base stations of different network types to adjust uplink configurations, thereby mediating the interference problem while maintaining spectrum utilization benefits

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements dynamic uplink configuration adjustment based on real-time interference detection. Instead of static frequency and time allocations, the system dynamically modifies uplink parameters (frequency bands, time intervals) in response to detected interference conditions, allowing the network to adaptively coexist in adjacent spectrum bands

Inventive Principle:

Principle #15Dynamics

2Reliability

If mobile devices operate at maximum output power in indoor environments, then communication reliability is improved, but prolonged service disruption occurs due to persistent interference

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidservice disruption duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent implements preliminary interference detection and preventive configuration adjustment. Before severe interference occurs, the system detects early signs of interference and proactively adjusts uplink configurations to prevent prolonged service disruption, rather than reacting after disruption has already occurred

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent establishes a feedback loop where base stations continuously monitor interference conditions and use this feedback to adjust uplink configurations. The detected interference information feeds back to the base station, which then modifies transmission parameters to eliminate the interference cause while maintaining communication reliability

Inventive Principle:

Principle #23Feedback

3Object-affected harmful factors

If base stations use site-planning and special filters to mitigate interference, then base station interference is reduced, but mobile device interference remains challenging and unresolved

Engineering Contradiction:

Improvebase station interferenceVSAvoidmobile device interference detection

Core Design Contradiction:

Object-affected harmful factorsVSDifficulty of detecting and measuring

Solution Approach 1:

The patent enables base stations to self-detect interference conditions affecting mobile devices and autonomously adjust their uplink configurations. Instead of relying on complex external detection systems, the base station uses its own received signals and quality indicators to identify interference and implement corrective actions

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent creates a universal interference mitigation mechanism that handles both base station-to-base station and mobile device-to-mobile device interference through the same detection and coordination framework. The system uniformly applies interference detection and configuration adjustment across different interference scenarios, eliminating the need for separate solutions

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8908571B2Enabling coexistence between wireless networks

Publication Date: 2014.12.09 CLEARWIRE IP HOLDINGS LLC

AI summary

Systems and methods for detecting and mitigating interference between from a first wireless time division duplex (TDD) communications device and a second wireless TDD communications device includes processing quality-indicator reports received from the first TDD device to determine if reception at the first TDD device has experienced interference from the second TDD device. Such interference at the first TDD device may indicate that the first TDD device may also cause interference to reception at the second TDD device. Accordingly, to mitigate the possible interference from the first TDD device, an uplink configuration of the first TDD base station may be adjusted. The adjustment of the uplink configuration may include configuring reception of data packets at the first TDD base station from the first TDD device in accordance with an interference-free time interval, an unprotected time interval, or a specific portion of an associated frequency band.