Co-located Antenna Dynamic Power Control for SAR Compliance

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Solution Overview

Problem

Current SAR power control mechanisms for wireless antenna systems in information handling systems do not account for variations in activity levels and data priority, leading to inefficient operation and potential exceedance of cumulative transmission power limits, which can result in reduced user experience and non-compliance with regulatory SAR restrictions.

Innovation Solution

A co-located antenna dynamic power control system that dynamically adjusts transmission power levels based on the activity modes, data transmission levels, and priority requirements of individual antenna systems, ensuring compliance with SAR limits by optimizing power distribution among active and inactive antennas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple antenna systems operate simultaneously at maximum power levels, then wireless communication performance is improved, but cumulative transmission power exceeds SAR regulatory limits

Engineering Contradiction:
Improvewireless communication performanceVSAvoidcumulative transmission power
Core Design Contradiction:
ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts the power levels of multiple antenna systems based on real-time operating conditions, activity modes, and data priority levels. Instead of operating all antennas at fixed maximum power, the controller continuously modulates power levels to maintain optimal communication performance while ensuring cumulative power remains within SAR limits. This dynamic adjustment allows the system to adapt to changing conditions and efficiently utilize the available power budget.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent applies different power levels to different antenna systems based on their individual activity modes, data transmission levels, and priority requirements. High-priority antennas with active data transmission receive higher power allocation, while low-priority or inactive antennas operate at reduced power or remain dormant. This localized quality approach ensures that power is distributed according to actual needs, improving overall system efficiency while complying with SAR regulations.

Inventive Principle:
Principle #3Local quality

2Object-affected harmful factors

If power levels are reduced to maintain SAR compliance, then harmful radiation levels are controlled, but wireless link performance deteriorates

Engineering Contradiction:
ImproveSAR complianceVSAvoidwireless link performance
Core Design Contradiction:
Object-affected harmful factorsVSProductivity

Solution Approach 1:

The system employs dynamic power control that continuously monitors and adjusts power levels across multiple antenna systems. When SAR limits approach thresholds, the controller dynamically redistributes the power budget among active antennas based on their current performance needs, data priority, and activity modes. This dynamic approach maintains SAR compliance while minimizing impact on wireless link performance by ensuring that critical communications receive adequate power even when total power must be reduced.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The power control mechanism automatically monitors its own operation, detecting when SAR limits are approached and self-adjusting power levels without external intervention. The system evaluates real-time conditions such as data transmission levels, activity modes, and signal quality, then autonomously redistributes power to maintain both regulatory compliance and acceptable performance. This self-service capability ensures continuous optimization without manual configuration or external control.

Inventive Principle:
Principle #25Self-service

3Speed

If all antenna systems operate at high power levels, then data transmission speed is improved, but power consumption increases

Engineering Contradiction:
Improvedata transmission speedVSAvoidpower consumption
Core Design Contradiction:
SpeedVSUse of energy by moving object

Solution Approach 1:

The system assigns different power levels to different antenna systems based on their individual requirements and current operating conditions. Rather than uniformly powering all antennas at high levels, the controller evaluates each antenna's activity mode, data priority, and transmission needs, then allocates power locally to each antenna. This ensures that only necessary antennas operate at high power for high-speed transmission, while other antennas consume minimal power, thereby optimizing the balance between data transmission speed and overall power consumption.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The power allocation system dynamically adjusts power levels in response to changing data transmission requirements. When high-speed transmission is needed on specific antennas, the system temporarily increases power to those antennas while reducing or suspending power to others. This dynamic reallocation allows the system to achieve high data transmission speeds when necessary while minimizing overall power consumption during normal or low-activity periods.

Inventive Principle:
Principle #15Dynamics

4Object-affected harmful factors

If power is dynamically adjusted among antenna systems, then SAR compliance is optimized, but system complexity increases

Engineering Contradiction:
ImproveSAR complianceVSAvoidpower control system complexity
Core Design Contradiction:
Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent combines multiple power control functions into a unified controller that manages all antenna systems simultaneously. Rather than implementing separate control mechanisms for each antenna, the system merges power level detection, activity mode monitoring, data priority evaluation, and power allocation into a single integrated control architecture. This merging reduces overall system complexity by eliminating redundant control circuits and simplifying the management of multiple antennas, while still achieving optimized SAR compliance through coordinated power adjustment across all systems.

Inventive Principle:
Principle #5Merging (Combining)

Data Source

PatentUS10136395B1System and method for co-located SAR control in an information handling system
Publication Date: 2018.11.20 DELL PROD LP
  • US10136395B1 patent drawing
  • US10136395B1 patent drawing
  • US10136395B1 patent drawing

AI summary

A method and information handling system including a wireless interface adapter for communicating on a plurality antenna systems for connection to a plurality of concurrently operating wireless links and a processor executing code instructions for a co-located antenna dynamic power control system for detecting a first active wireless link operating via a first antenna system and a second active wireless link operating via a second, co-located antenna system, wherein the total transmission power between the first antenna system and the second antenna system is limited to a regulatory safety maximum. The processor determining relative transmission activity levels for the information handling system relative to the first active wireless link and the second active wireless link, including a first wireless link data rate transmission level for the first antenna system and a second wireless link data rate transmission level for the second antenna system and the co-located antenna dynamic power control system instructing the wireless interface adapter controller to increase transmission power to the first antenna and decrease transmission power to the second antenna relative to the regulatory safety maximum power level when the first wireless link data rate transmission level is greater than the second wireless link data rate transmission level.