Wireless Station Radar Interference Handling

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current wireless communication systems in infrastructure mode fail to maintain communication when a radar signal is detected, especially when the access point does not recreate the network on a new frequency channel, leading to disruption in communication between stations.

Innovation Solution

A wireless communication apparatus and method that enables direct communication between devices by sharing communication setting information and switching to ad-hoc mode upon detecting a radar signal, allowing stations to automatically change channels and continue communication without relying on the access point's DFS functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the access point stops transmission when radar signal is detected, then radio interference with radar system is avoided, but communication between stations is disrupted

Engineering Contradiction:

Improveradio interference with radar systemVSAvoidcommunication continuity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The system segments the communication function from the access point to the stations themselves. When radar interference is detected, individual stations independently switch to ad-hoc mode and establish direct peer-to-peer communication links, separating the DFS detection function from the network coordination function that the access point provides.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The communication mode dynamically switches between infrastructure mode (via access point) and ad-hoc mode (direct station-to-station). This dynamic adaptation allows the system to maintain communication reliability by transitioning to a different operational mode when radar interference occurs, rather than simply stopping transmission.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the access point recreates the network on a new frequency channel, then communication can continue, but this requires the access point to have DFS functionality

Engineering Contradiction:

Improvecommunication continuityVSAvoiddependency on access point DFS functionality

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Stations perform self-service by independently detecting radar signals and autonomously switching to ad-hoc mode for direct communication. This eliminates the need for stations to depend on the access point's DFS functionality, as each station becomes self-sufficient in detecting interference and adapting its communication method.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Instead of the access point controlling the DFS response and stations passively following, the invention inverts the control relationship: stations actively detect radar signals and initiate the mode switch to ad-hoc communication, making the stations the active agents rather than passive followers of access point commands.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If stations scan networks to find the access point on a new channel, then communication can be restored, but this process is time-consuming

Engineering Contradiction:

Improvecommunication restorationVSAvoidtime for network scanning and reassociation

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Stations perform preliminary actions by maintaining ad-hoc communication capabilities and sharing information while in infrastructure mode. When radar interference is detected, the switch to ad-hoc mode is immediate because the necessary communication protocols and connections are already prepared, eliminating the need for time-consuming network scanning and reassociation procedures.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If frequency hopping is used to avoid interfering frequencies, then communication can continue on non-interfered channels, but this requires pre-storing interfering frequency values

Engineering Contradiction:

Improvecommunication continuity on non-interfered channelsVSAvoidfrequency management procedures

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system changes the fundamental parameter of communication mode from infrastructure mode (AP-mediated) to ad-hoc mode (direct peer-to-peer). This parameter change allows stations to bypass complex frequency hopping procedures and interfering frequency management, as direct ad-hoc communication on the current channel or rapid mode switching simplifies the frequency management requirements.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8509181B2Wireless communication apparatus and communication method therefor

Publication Date: 2013.08.13 CANON KK

AI summary

When a wireless communication apparatus capable of directly communicating with another communication apparatus performs communication via an access point, the wireless communication apparatus shares communication setting information with the other communication apparatus, the communication setting information being information for performing direct communication with the other communication apparatus without using that access point. If a radar signal is detected during communication with the other communication apparatus via the access point, switching to direct communication with the other communication apparatus is made based on the shared communication setting information.