Wireless Node Power Control for Spectrum Utilization

Solution Overview

Problem

The 802.11 DCF access mechanism reduces spectrum resource utilization as adjacent nodes stop data transmission upon receiving RTS or CTS control packets, leading to inefficient use of spectrum resources.

Innovation Solution

A data transmission method where nodes determine a power update value based on initial transmit power, allowing adjacent nodes to perform control packet transmission using limited powers that do not cover the sending and receiving nodes, optimizing power matching and reducing consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If adjacent nodes stop data transmission upon receiving RTS or CTS control packets, then data transmission reliability is improved, but spectrum resource utilization deteriorates

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidspectrum resource utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements differentiated power control where adjacent nodes transmit control packets at limited power levels when located beyond the coverage of updated transmit power, rather than uniformly stopping all transmissions. This local differentiation allows nodes in certain spatial regions to maintain transmissions while protecting the primary communication link, thus improving spectrum utilization without compromising reliability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent dynamically adjusts transmit power parameters based on spatial location and coverage conditions. By calculating updated transmit power values and comparing them with initial power levels, the system determines whether adjacent nodes should transmit at limited power or stop transmissions, thereby optimizing the balance between reliability and spectrum efficiency through parameter adaptation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If nodes transmit control packets at initial power levels, then control signal reliability is improved, but power consumption deteriorates

Engineering Contradiction:

Improvecontrol signal reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent dynamically adjusts transmit power parameters based on spatial location and coverage conditions. By calculating updated transmit power values and comparing them with initial power levels, the system determines whether adjacent nodes should transmit at limited power or stop transmissions, thereby optimizing the balance between reliability and spectrum efficiency through parameter adaptation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies partial power transmission by allowing adjacent nodes to transmit control packets at limited power levels rather than full initial power, when the nodes are located beyond the coverage area. This partial action approach reduces power consumption while maintaining sufficient control signal reliability for nodes in the extended coverage region.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10499429B2Using control packet transmissions to coordinate data transmissions at lowered power

Publication Date: 2019.12.03 HUAWEI TECH CO LTD

AI summary

A sending node sends an RTS control packet carrying an identifier of a receiving node, so that the receiving node determines a power update value according to an initial transmit power of the RTS control packet and sends a CTS control packet by using the initial transmit power, where the CTS control packet carries an identifier of the sending node and the power update value, a first part of adjacent nodes other than the sending node, if determining that the first part of adjacent nodes are located beyond coverage of an updated power of the receiving node and the sending node, determine a first limited power and perform control packet transmission according to the first limited power; and receiving, by the sending node, the CTS control packet, and sending a data packet by using the updated power.