Nominal Interference Feedback for Wireless Resource Coordination

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Solution Overview

Problem

Wireless communication systems face challenges in managing interference, particularly in unplanned and interference-limited networks like Femto networks, where existing methods fail to effectively mitigate interference between base stations and user equipment, leading to degradation in transmission rates.

Innovation Solution

A method is introduced to compute and transmit nominal interference to interfering base stations, allowing them to assess the impact on out-of-cell user equipment and adjust their transmission to minimize interference, involving the receipt and processing of pilot signals, measurement reports, and scheduling information to optimize resource utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If base stations transmit over the same resources without coordination, then resource utilization is high, but interference to out-of-cell user equipment increases and transmission rate deteriorates

Engineering Contradiction:

Improveresource utilizationVSAvoidinterference to out-of-cell user equipment

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the serving base station receives interference measurements from user equipment and sends this information back to interfering base stations. The interfering base stations use this feedback to adjust their transmission decisions, creating a closed-loop system that balances resource utilization with interference management.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The serving base station acts as an intermediary between the interfering base station and the user equipment. It collects interference measurements from the user equipment and communicates this information to the interfering base station, enabling coordinated resource allocation without direct interference between base stations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If interfering base stations reduce transmission to minimize interference, then interference to user equipment decreases, but overall system transmission rate is reduced

Engineering Contradiction:

Improveinterference levelVSAvoidsystem transmission rate

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Instead of completely reducing transmission, the patent applies partial action by having interfering base stations transmit only when the calculated transmission rate loss is below a threshold. This allows beneficial transmissions to occur while preventing excessive interference, achieving a balance between interference reduction and maintaining system throughput.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent dynamically changes transmission parameters (transmission rate, resource allocation) based on calculated interference impacts. Base stations adjust their transmission behavior by modifying these parameters according to the computed transmission rate loss, enabling adaptive interference management that preserves overall system productivity.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If base stations coordinate transmissions to reduce interference, then user equipment transmission rate improves, but system complexity increases

Engineering Contradiction:

Improveuser equipment transmission rateVSAvoidinterference coordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the complexity of interference coordination from the base stations themselves and places it in the serving base station, which has access to user equipment measurements. This centralizes the computational burden and simplifies the interfering base stations, reducing overall system complexity while maintaining coordination benefits.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The user equipment performs self-service by measuring interference from neighboring base stations and reporting these measurements to the serving base station. This eliminates the need for complex interference measurement and reporting mechanisms at the base station level, simplifying the coordination process.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8958833B2Systems, apparatus and methods for interference management on downlink channels in wireless communication systems

Publication Date: 2015.02.17 QUALCOMM INC

AI summary

Systems, methods, apparatus and computer program products to facilitate determining nominal interference from one or more interfering base stations are provided. In one embodiment, the method can include computing a nominal interference. The method can also include transmitting the nominal interference to one or more interfering base stations. The nominal interference can be transmitted to at least one of the one or more interfering base stations to compute a loss in transmission rate to a user equipment in a selected cell if at least one of the one or more interfering base stations transmits over a same set of resources on which the user equipment in the selected cell receives information.