Ad-Hoc Wireless Stations Radar Detection Power Management

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Solution Overview

Problem

Ad-hoc wireless communication systems without a central control station face challenges in efficiently detecting radar waves and changing frequencies to avoid interference, particularly concerning power consumption, which affects the operating time and device size, weight, and price.

Innovation Solution

Implementing a time-sharing mechanism where communication stations alternate between interference avoidance and normal operation modes for radar wave detection and dynamic frequency selection, with a sequence table managing the order and power allocation to reduce average power consumption and prevent radar wave interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all communication stations continuously perform radar wave detection and dynamic frequency selection in an ad-hoc wireless communication system, then radar wave interference is avoided, but power consumption increases significantly

Engineering Contradiction:

Improveradar wave interference avoidanceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic radar wave detection where communication stations alternate between detection and non-detection states. Each station performs radar wave detection at specific time intervals determined by a sequence table, rather than continuously. This periodic operation reduces power consumption while maintaining radar wave interference avoidance through coordinated frequency changes when detection occurs.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent divides the communication stations into different roles using a sequence table, where only specific stations perform radar wave detection at any given time. This segmentation of detection responsibilities among multiple stations reduces the overall power consumption of the network compared to having all stations detect continuously, while still providing comprehensive radar wave monitoring coverage.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If communication stations perform radar wave detection and frequency changes autonomously in an ad-hoc network, then no central control station is needed, but coordination complexity increases

Engineering Contradiction:

Improvecentral control station requirementVSAvoidcoordination difficulty

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent establishes a sequence table in advance that pre-determines which communication stations will perform radar wave detection at specific time intervals. This preliminary arrangement of detection responsibilities eliminates the need for real-time coordination negotiations, reducing operational complexity while maintaining autonomous distributed operation without a central control station.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The sequence table acts as an intermediary mechanism that coordinates radar wave detection activities among distributed communication stations. Instead of requiring direct communication and negotiation between stations, the sequence table provides a predefined coordination framework that simplifies operation while maintaining the ad-hoc network's autonomous nature.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If communication stations reduce radar wave detection frequency to save power, then power consumption decreases, but radar wave detection reliability deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidradar wave detection reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent combines the radar wave detection functions of multiple communication stations into a coordinated system. By having multiple stations perform detection at different time intervals as specified in the sequence table, the system achieves comprehensive radar wave monitoring coverage equivalent to continuous detection by a single station, while distributing the power consumption across multiple stations.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent ensures continuous radar wave detection coverage by having multiple communication stations alternate their detection activities according to the sequence table. Although individual stations operate intermittently, the collective detection effort maintains continuous monitoring of the frequency band, preserving detection reliability while reducing overall power consumption through duty cycling.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS7400612B2Wireless communication system, wireless communication apparatus, wireless communication method, and computer program

Publication Date: 2008.07.15 SONY GROUP CORP

AI summary

Disclosed is radar wave detection and DFS (dynamic frequency selection) with high efficiency while considering, for instance, the power consumption of each communication station within an autonomous distributed network. At least one communication station runs in an interference avoidance operation mode, operates a radar wave detection section, and fulfills the obligation to issue instructions for radar wave detection and DFS for an approximately predetermined period of time. After the lapse of the approximately predetermined period of time, another communication station switches to the interference avoidance operation mode and assumes the obligation to issue instructions for radar wave detection and DFS. In other words, two or more communication stations sequentially run in the interference avoidance operation mode in a time sharing manner. Therefore, the average power consumption of the communication stations decreases.