Multi-mode Device Spectrum Access via Location Filtering

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Solution Overview

Problem

Multi-mode devices operating in cellular and Wi-Fi networks face interference when expanding bandwidth in the DSRC spectrum, as they may disrupt dedicated short-range communication (DSRC) transmissions, particularly in areas like roads and highways where DSRC is used.

Innovation Solution

The use of location information to determine whether to operate within the DSRC spectrum, with devices outside of DSRC transmission regions being allowed to use at least a portion of the DSRC spectrum to avoid interference, by comparing current location data to a database or receiving instructions from an access point.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multi-mode devices expand bandwidth using the DSRC spectrum, then data rate and throughput increase, but interference to DSRC-related transmissions occurs

Engineering Contradiction:

Improvedata rateVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by enabling multi-mode devices to use the DSRC spectrum only in specific geographical locations (non-DSRC areas) while avoiding DSRC transmission areas. The system determines location using GPS coordinates and compares them against databases of DSRC and non-DSRC areas, allowing bandwidth expansion only where it won't interfere with DSRC operations. This spatial differentiation resolves the contradiction by making spectrum usage location-dependent.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements preliminary action by having multi-mode devices determine their location and check against DSRC area databases before using the DSRC spectrum. The device receives location information, compares it with stored geographical data, and only then decides whether to access the DSRC spectrum. This advance verification prevents interference before it occurs while still allowing bandwidth expansion when safe.

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If multi-mode devices use the DSRC spectrum in DSRC transmission areas, then available bandwidth increases, but DSRC transmission reliability deteriorates

Engineering Contradiction:

Improveavailable bandwidthVSAvoidDSRC transmission reliability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the potential harm of spectrum interference into benefit by using location information and databases to identify where DSRC transmissions do not occur. Instead of blindly avoiding the entire DSRC spectrum, the system uses geographical data to find non-DSRC areas where the spectrum can be safely used, transforming the constraint into an opportunity for bandwidth expansion in specific locations.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Adaptability or versatility

If multi-mode devices opportunistically access the DSRC spectrum based on location, then spectrum utilization efficiency improves, but device complexity increases

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent uses databases of DSRC and non-DSRC areas as an intermediary between the device and the spectrum decision-making process. Instead of requiring complex real-time sensing and analysis, the device simply compares its location against pre-stored geographical data in the database. This intermediary database simplifies the device's task while enabling sophisticated spectrum access decisions based on location.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent uses a simplified representation of the physical world through 2D maps and GPS coordinates stored in databases. Instead of requiring devices to process complex spatial relationships in real-time, the system uses copied geographical data that can be easily queried and compared. This copying of location information into structured databases reduces computational complexity while maintaining accurate spectrum access decisions.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS9554353B2Location based use of the DSRC spectrum

Publication Date: 2017.01.24 QUALCOMM INC

AI summary

Methods, systems, and devices are described for using location information to determine whether to use at least a portion of a dedicated short range communications (DSRC) spectrum. Current location information of a multi-mode device is determined. The multi-mode device is operating outside of the DSRC spectrum. The current location information is used to determine whether the multi-mode device is located outside of geographical region attributed to DSRC transmissions. Upon determining that the multi-mode device is located outside of the geographical region, at least a portion of the DSRC spectrum is used for transmissions by the multi-mode device.