Asynchronous Interference Management in Wireless Systems

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in managing asynchronous interference, leading to poor utilization, limited fairness control, and susceptibility to hidden and exposed nodes, particularly between unsynchronized devices.

Innovation Solution

The method involves receiving forwarded interference-related information, identifying asynchronous interference, determining a share of resources based on the interference, and reserving resources to manage asynchronous interference through techniques like backing off in frequency or time, and using back-off beacons for fair sharing of communication resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If synchronous interference management messages are used to control interference, then interference control effectiveness is improved for synchronized devices, but the scheme becomes ineffective for asynchronous devices that are not monitoring the channel at designated times

Engineering Contradiction:

Improveinterference control effectivenessVSAvoidapplicability to asynchronous devices

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Instead of having devices monitor for interference management messages at designated times (synchronous approach), the patent inverts the approach by having devices transmit interference management messages continuously or asynchronously, allowing receivers to detect interference regardless of synchronization status. This resolves the contradiction by making interference control effective for both synchronized and asynchronous devices.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces dynamic interference management where devices can adapt their transmission timing and message content based on current interference conditions rather than following fixed synchronous schedules. This dynamic approach allows the system to handle both synchronous and asynchronous devices effectively, resolving the contradiction between control effectiveness and adaptability.

Inventive Principle:

Principle #15Dynamics

2Reliability

If carrier sense multiple access techniques are employed in asynchronous systems, then interference control is provided, but resource utilization becomes poor and the system suffers from hidden and exposed nodes problems

Engineering Contradiction:

Improveinterference control capabilityVSAvoidresource utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements feedback mechanisms where receivers send interference management messages back to transmitters based on actual interference experienced. This feedback loop allows for dynamic resource allocation and conflict resolution, improving resource utilization while maintaining interference control capability, thus resolving the contradiction between reliability and productivity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent uses preliminary actions by having devices transmit interference management messages before actual data transmission to reserve resources and avoid conflicts. This preliminary resource reservation improves resource utilization by preventing collisions before they occur, while maintaining interference control through the message exchange mechanism.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If devices transmit interference management messages at designated times in synchronous systems, then interference control is achieved for synchronized devices, but asynchronous interferers cannot be detected or managed

Engineering Contradiction:

Improveinterference management reliabilityVSAvoiddetection of asynchronous interferers

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent inverts the traditional approach by having receivers actively detect and respond to interference from any source regardless of synchronization, rather than relying on synchronized message exchanges. This allows asynchronous interferers to be detected and managed effectively while maintaining reliable interference control for synchronized devices.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces interference management messages as intermediaries that facilitate communication between devices with different synchronization statuses. These messages carry interference information and coordination data that allow both synchronous and asynchronous devices to coexist and be managed effectively, resolving the detection difficulty for asynchronous interferers.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP2475210B1Asynchronous interference management

Publication Date: 2018.04.18 QUALCOMM INC

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AI summary

A method of wireless communication, comprising: identifying asynchronous interference; determining a share of resources to use based on the identified asynchronous interference; and reserving resources based on the determined share of resources as well as a corresponding apparatus.