Vehicle Wireless Network Access Point Zigzag Placement

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Solution Overview

Problem

In vehicles with multiple aisles, conventional wireless network systems face interference between access points, leading to reduced usable bandwidth and signal quality due to reflection and overlapping signal ranges, with existing solutions failing to provide effective positioning strategies for access points.

Innovation Solution

The wireless network system deploys access points above the aisles, with adjacent points positioned at greater distances and using different frequency bands to minimize interference, and concentrates antennae for multiple seats to ensure uniform signal reception, thereby reducing signal overlap and maintaining bandwidth.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If access points are positioned at equidistant intervals from front to back inside the passenger cabin to ensure signal coverage, then signal reach is improved, but interference between adjacent access points increases and signal quality drops

Engineering Contradiction:

Improvesignal reachVSAvoidsignal quality

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent transitions from positioning access points along a single dimension (front to back in one aisle) to utilizing multiple dimensions by placing access points in multiple aisles with specific spacing. This spatial reconfiguration allows signals to reach throughout the cabin while maintaining quality by preventing overlapping interference zones between adjacent access points.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent applies different positioning strategies to different locations within the cabin. Access points are selectively placed in specific aisles at predetermined intervals, creating localized optimal signal zones that collectively provide comprehensive coverage without uniform interference patterns.

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If signal strength is increased to reach both ends of the vehicle, then coverage area is improved, but interference between adjacent access points increases

Engineering Contradiction:

Improvecoverage areaVSAvoidinterference

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent segments the cabin space into multiple aisles, each containing access points at specific intervals. This segmentation allows the coverage area to be divided into manageable zones where interference can be controlled, rather than attempting to provide uniform high-strength coverage across the entire cabin with fewer access points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces spatial separation as an intermediary mechanism between adjacent access points. By positioning access points in different aisles with predetermined spacing, the physical distance acts as a mediator that reduces signal interference while still allowing each access point to maintain sufficient signal strength for its designated coverage zone.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If wired conductors are laid to connect terminals to the network, then communication reliability is improved, but installation time and maintenance cost increase

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidinstallation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the mechanical wired connection system with a wireless communication system. Access points transmit signals wirelessly to terminals throughout the cabin, eliminating the need for physical conductor installation while maintaining communication functionality. This substitution preserves reliability through proper wireless positioning while dramatically reducing installation time and maintenance requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS7680454B2Wireless network located within a vehicle containing access points and terminals for wireless communication

Publication Date: 2010.03.16 PANASONIC HOLDINGS CORP

AI summary

A wireless network system arranges a plurality of access points along the aisles in a vehicle having two or more aisles. The positions of the access points on the first aisle and the positions of the access points on the second aisle are arranged in a zigzag pattern. The distance between neighboring access points is thus great, and there is no signal interference between adjacent access points.