Dynamic RF EMF Resource Allocation for Wireless Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cellular communication systems face challenges in meeting radio frequency (RF) electromagnetic field (EMF) exposure limits due to fluctuating transmitted power from digital, analog, or hybrid beamforming, which can impact system capacity and coverage.
Innovation Solution
The proposed solution involves allocating radio resources to wireless devices based on their priority, derived from power headroom and performance metrics, ensuring transmissions do not exceed the RF EMF limits in each spatial direction, and updating these priorities and metrics dynamically during each transmission time interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used to spatially shape radiated RF EMF to provide higher system capacity and coverage, then system capacity and coverage are improved, but the transmitted power fluctuates in spatial directions making it challenging to meet RF EMF limits
Solution Approach 1:
The patent implements dynamic resource allocation where the network node continuously adjusts transmission parameters based on real-time beamforming configurations and spatial power distribution. The scheduler dynamically determines resource block allocations and transmission power levels to ensure RF EMF limits are met while maximizing system capacity under varying beamforming conditions
Solution Approach 2:
The patent changes operational parameters including transmission power levels, resource block assignments, and scheduling decisions based on the instantaneous beamforming state and spatial power profile. By adjusting these parameters dynamically, the system adapts to fluctuating power distributions and maintains compliance with RF EMF limits while preserving capacity
2Reliability
If existing solutions limit average transmit power by reducing radio resources or eliminating transmissions, then RF EMF limits are satisfied, but system capacity is negatively impacted
Solution Approach 1:
The patent applies local quality control by examining and managing power distribution in specific spatial directions rather than applying uniform limits. The network node calculates spatial power profiles and directs resource allocation to optimize coverage in directions where power headroom is available, while restricting transmissions in directions approaching EMF limits, thereby maintaining overall system capacity
Solution Approach 2:
The patent implements feedback mechanisms where the network node continuously monitors spatial power distribution, beamforming state, and power headroom calculations. Based on this feedback, the scheduler adjusts resource allocations and transmission decisions in real-time to ensure EMF compliance while maximizing capacity utilization
3Object-affected harmful factors
If existing solutions eliminate transmissions or limit allocated resource blocks when total average transmit power approaches RF EMF limit, then EMF exposure is controlled, but wireless device performance and fairness are compromised
Solution Approach 1:
The patent performs preliminary calculations of power headroom and spatial power profiles before resource allocation decisions are made. By pre-assessing the impact of potential transmissions on EMF limits, the system can make informed scheduling decisions that prevent excessive EMF exposure while preserving transmission opportunities for devices with lower power footprints or more favorable spatial positions
Data Source
AI summary
A method, system and apparatus are disclosed. According to one or more embodiments, a network node is provided. The network node includes processing circuitry configured to determine a respective allocation priority for each of a plurality of wireless devices where each respective allocation priority is based at least on a power headroom with respect to a radio frequency, RF, electro-magnetic-field, EMF, limit and at least one performance metric for a respective wireless device of the plurality of wireless devices, and allocate resources to at least one of the plurality of wireless devices based at least on the respective allocation priorities associated with the plurality of wireless devices.