Transmission Node Unavailable Time Period Signaling for Energy Saving

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Solution Overview

Problem

In IEEE 802.15.4e standard's non-beacon mode, reception nodes experience unnecessary power consumption due to incorrect scheduling, as transmission nodes may fail to recognize and transmit during unavailable time periods, leading to unnecessary listening states.

Innovation Solution

Transmission nodes generate and transmit information about their unavailable time periods to reception nodes, allowing them to operate in a sleep state during these times, using formats like bitmap, number of unit times, or indicators, thereby reducing unnecessary listening and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the reception node continuously operates in a listening state to receive data, then the reliability of data reception is improved, but the energy consumption increases

Engineering Contradiction:

Improvedata reception reliabilityVSAvoidreception node energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The transmission node performs preliminary action by generating and transmitting unavailable time period information before the reception node needs to decide whether to listen. This allows the reception node to advance know when the transmission node will not be available, enabling it to skip listening during those periods and save energy while maintaining reliability during available periods

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by having the transmission node provide information about its transmission availability status to the reception node. This feedback mechanism allows the reception node to adjust its listening behavior based on the transmission node's actual availability, resolving the contradiction between continuous listening for reliability and energy saving

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the transmission node fails to transmit data during the reception node's listen interval, then the transmission schedule flexibility is improved, but the reception node experiences unnecessary power consumption from converting to listening state

Engineering Contradiction:

Improvetransmission schedule flexibilityVSAvoidreception node power consumption

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The transmission node performs preliminary action by determining and communicating its unavailable time periods in advance. This allows the reception node to know beforehand when transmission will not occur, so it can remain in sleep state during those periods even if they fall within its listen interval, avoiding unnecessary power consumption while maintaining schedule flexibility

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The unavailable time period information acts as feedback from the transmission node to the reception node, enabling the reception node to adjust its power consumption behavior based on actual transmission plans, thus resolving the energy waste caused by schedule changes

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9629085B2Reception node and transmission node for saving energy of reception node, and communication method thereof

Publication Date: 2017.04.18 SAMSUNG ELECTRONICS CO LTD

AI summary

A communication method of a transmission node includes generating information of a transmission unavailable time period of the transmission node in a reception available time period of a reception node, and transmitting, to the reception node, the information of the transmission unavailable time period. The reception node operates in a sleep state based on the information of the transmission unavailable time period.