Spatial Reuse Transmission Power Control in Wireless Networks

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Solution Overview

Problem

The IEEE 802.11 ax standard lacks specifications for determining transmission power levels and handling transmission based on spatial reuse, leading to inefficiencies in wireless communication systems.

Innovation Solution

A communication device is configured to detect reception power levels, calculate minimum and maximum downward adjustment values, and determine whether to transmit packets based on these values to optimize transmission power and avoid interference, thereby enabling efficient spatial reuse.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spatial reuse is implemented to reuse radio resources of OBSSs, then transmission efficiency is improved, but transmission power control and interference management become more complex

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidtransmission power control complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the parameter of transmission power level by introducing dynamic adjustment mechanisms. The first communication device determines a maximum transmission power level based on the second power level (reception power level of first packet) and compares it with a threshold to decide whether to perform spatial reuse transmission. This parameter-based control simplifies the complexity of power management while enabling efficient spatial reuse.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback mechanism where the first communication device detects the reception power level of packets from second communication devices, uses this information to determine appropriate transmission power levels, and adjusts its transmission accordingly. This closed-loop feedback approach enables automatic interference management and power control, resolving the complexity issue while maintaining high transmission efficiency.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If maximum transmission power level is specified without operational details, then implementation flexibility is improved, but transmission reliability deteriorates due to lack of guidance

Engineering Contradiction:

Improveimplementation flexibilityVSAvoidtransmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces dynamic power level determination where the maximum transmission power level is not fixed but calculated based on the second power level (reception power level) and compared with a threshold. This dynamic approach provides both flexibility (adaptability to different scenarios) and reliability (guided decision-making process), resolving the contradiction between implementation flexibility and transmission reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent performs preliminary power level determination before actual transmission by comparing the calculated maximum transmission power level with a threshold. This preliminary action ensures that transmission decisions are made with proper power control guidance, improving reliability while maintaining the flexibility to adapt to different channel conditions.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If transmission power is increased to ensure packet reception, then reception reliability is improved, but interference to other transmissions increases

Engineering Contradiction:

Improvepacket reception reliabilityVSAvoidinterference to other transmissions

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the transmission power parameter dynamically by determining a maximum transmission power level based on the second power level and comparing it with a threshold. When spatial reuse is permitted, the device transmits at this controlled power level rather than maximum power, ensuring sufficient reception reliability while limiting interference to other transmissions through parameter-based power control.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful effect of high transmission power (interference) into a beneficial control mechanism. By using the second power level (reception power level of first packet) as a reference to determine the maximum transmission power level, the system transforms potential interference into a guided power adjustment strategy that ensures reliable reception while minimizing harm to other transmissions.

Inventive Principle:

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

Data Source

PatentUS11382045B2Device and method of handling a transmission based on spatial reuse

Publication Date: 2022.07.05 REALTEK SEMICON CORP

AI summary

A first communication device for handling a transmission based on spatial reuse comprises at least one storage device; and at least one processing circuit, coupled to the at least one storage device, wherein the at least one storage device stores instructions, and the at least one processing circuit is configured to execute the instructions of: detecting a reception power level of a first packet transmitted in a channel by a second communication device; determining a minimum downward adjustment value according to the reception power level; determining a maximum downward adjustment value according to a reference transmission power level; and determining whether to transmit a second packet to a third communication device in the channel according to the minimum downward adjustment value and the maximum downward adjustment value.