Modulating Channel Access Parameters for Data Communication

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Solution Overview

Problem

Current wireless communication systems face limitations in conveying additional data during channel access without degrading the channel access process or violating channel access standards, particularly in systems like Cospas-Sarsat, where position resolution is limited, affecting search and rescue operations.

Innovation Solution

Modulating channel access parameters such as transmission time, frequency, or spreading code to convey plain information during the channel access phase, using techniques like TDMA, FDMA, or CDMA, allowing for enhanced data communication without significant hardware changes or disrupting the existing signal format.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If channel access parameters are modulated to convey additional data, then data communication capability is improved, but channel access performance may deteriorate

Engineering Contradiction:

Improvedata communication capabilityVSAvoidchannel access performance

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent modulates channel access parameters (transmission time, frequency, spreading code) to convey additional data. By changing the values of these parameters within their defined ranges, the system encodes information in the channel access signals themselves, thereby improving data communication capability without requiring separate communication channels.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The channel access parameters serve dual functions: they control channel access timing and frequency allocation, and simultaneously convey additional data information. This multi-functionality allows the same signal elements to perform both channel access control and data communication, resolving the contradiction between improving data capability and maintaining access performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of information

If additional data is conveyed during channel access, then information transmission is improved, but channel access standards may be violated

Engineering Contradiction:

Improveinformation transmissionVSAvoidcompatibility with channel access standards

Core Design Contradiction:

Loss of informationVSAdaptability or versatility

Solution Approach 1:

The patent conveys additional data by modulating channel access parameters (time, frequency, spreading code) within their standard-defined ranges and resolutions. By operating within the existing parameter spaces defined by channel access standards, the system transmits information without violating standard compliance requirements.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If channel access parameters are used for data communication, then communication efficiency is improved, but measurement precision of position determination deteriorates

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidposition determination accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent segments the channel access parameter into a coarse resolution part and a fine resolution part. The coarse part maintains compatibility with existing systems and standards, while the fine part conveys additional data information. This segmentation allows position determination to use the coarse part for accuracy while the fine part provides supplementary communication data.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent modifies channel access parameters within their defined resolution ranges to convey data. By operating within the standard-defined parameter spaces and resolutions, the system enables additional communication while preserving the measurement precision required for accurate position determination in systems like Cospas-Sarsat.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If channel access parameters are modulated, then data rate is improved, but device complexity increases

Engineering Contradiction:

Improvedata rateVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses the existing channel access signal structure and parameters to convey data, allowing the system to serve its own communication needs without requiring separate dedicated communication hardware or protocols. The channel access signals themselves carry the additional information, reducing the need for additional complex communication infrastructure.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9699689B2Communication of plain information during channel access

Publication Date: 2017.07.04 KATZ

AI summary

A method for communication of plain information during channel access, according to a pre-defined channel access scheme, such as TDMA or FDMA or CDMA, by slightly modulating in a transmitter a parameter related to the channel access, such as time of transmission or frequency of transmission, using this modulation to encode plain information, while keeping the channel and the compatible receiver tolerant to this slight modulation.