Wireless Access Control via Staggered Transmission Timing

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Solution Overview

Problem

Existing wireless communication methods using CSMA access control struggle to prevent collisions between data packets transmitted by multiple devices, especially when devices need to periodically transmit varying control data without delay, and fail to evenly distribute transmission intervals.

Innovation Solution

Implementing a wireless communication method where access control start times are set based on the time each device takes to obtain a right to transmit, varying these times to avoid coincidences, and using pair communication to alternate transmission periods during congestion, ensuring constant-length data packet transmissions and monitoring channel congestion to adjust access control timing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If access control start time is set autonomously without regard to other communication devices, then each device can independently control its transmission timing, but the probability of collision between data packets increases when more devices use the same wireless channel

Engineering Contradiction:

Improveindependent transmission timing controlVSAvoiddata packet collision probability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent divides the wireless communication system into paired communication device groups, where each pair independently manages its transmission timing. This segmentation allows devices to operate autonomously within their pairs while reducing overall collision probability in the shared wireless channel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic transmission timing where communication devices transmit data packets at regular intervals determined by pairing information. This periodic action creates predictable transmission patterns that reduce random collisions while maintaining independent device operation.

Inventive Principle:

Principle #19Periodic action

2Productivity

If the number of data packets transmitted is increased when transmission waiting time is long, then the volume of data transmitted by multiple devices can be averaged, but the data packet transmission intervals cannot be averaged and constant period transmission cannot be achieved

Engineering Contradiction:

Improvedata transmission volume averagingVSAvoidtransmission interval regularity

Core Design Contradiction:

ProductivityVSDuration of action of moving object

Solution Approach 1:

The patent establishes pairing information and transmission timing in advance, before actual data transmission begins. This preliminary action allows devices to pre-coordinate their transmission intervals, ensuring both averaged data volume and regular transmission periods from the start of communication.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8085706B2Wireless communication method and apparatus

Publication Date: 2011.12.27 DENSO CORP

AI summary

A wireless communication method and apparatus for the same performs access control in the following manner, where an acquisition of a right to transmit is performed by CSMA access control method, and a collision of transmitted data packets among different communication apparatuses is prevented for facilitating a stable transmission of data packets from each of the apparatuses in a predetermined interval. The transmission of a data packet having a predetermined data length under a cyclical access control sets an access control start time at a time that is after a lapse of predetermined amount of time from the previous acquisition of the right to transmit. As a result, the competition of the right to transmit is resolved due to a different access control start time set for the next transmission.