MPE Handling in Over-the-Air Gradient Vector Aggregation
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in managing maximum permissible exposure (MPE) conditions during over-the-air gradient vector aggregation in federated learning, where uplink transmissions may exceed safe exposure thresholds, potentially harming users and requiring adjustments in transmission power to comply with safety limits.
Innovation Solution
The system implements a method where user equipment (UE) receives a federated learning model from a base station, updates it based on whether an uplink transmission would exceed the MPE threshold, and drops the transmission if necessary, while the base station configures and receives updates from UEs to ensure transmissions do not exceed configured receive power levels, thereby managing MPE thresholds dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmission power is increased to maintain communication reliability in federated learning, then gradient vector aggregation reliability is improved, but maximum permissible exposure threshold is exceeded causing safety violations
Solution Approach 1:
The system dynamically adjusts transmission power levels based on real-time MPE condition assessments. The UE continuously monitors whether uplink transmissions would exceed MPE thresholds and adapts power levels accordingly, switching between high power (for reliability) and low power (for safety compliance) modes as needed
Solution Approach 2:
The base station provides feedback information about MPE conditions and configured receive power levels to the UE. This feedback loop enables the UE to adjust its transmission power levels appropriately, ensuring that gradient vector aggregations maintain reliability while staying within safety thresholds
2Object-affected harmful factors
If transmission power is reduced to comply with MPE safety thresholds, then safety is improved, but uplink transmission reliability deteriorates
Solution Approach 1:
The system implements dynamic power adjustment where the UE transitions between different transmission power states based on MPE conditions. When MPE thresholds would be exceeded, the UE reduces power to compliant levels; when safety is not a concern, the UE utilizes higher power for optimal communication performance
Solution Approach 2:
The system changes the transmission power parameter adaptively based on the operational context and MPE conditions. The UE modifies its transmission power level as a variable parameter, selecting appropriate values that balance safety compliance with communication reliability for each specific transmission scenario
3Object-affected harmful factors
If transmission power is dynamically adjusted to manage MPE conditions, then safety compliance is improved, but system complexity increases
Solution Approach 1:
The UE performs self-assessment of MPE conditions by evaluating whether its intended uplink transmission would exceed safety thresholds. This self-service capability allows the UE to autonomously determine appropriate power levels without requiring complex external control systems or continuous manual intervention
Solution Approach 2:
The system performs preliminary assessment of MPE conditions before initiating uplink transmissions. The UE evaluates potential MPE violations in advance and pre-adjusts transmission power levels accordingly, avoiding the need for complex real-time corrections or post-hoc safety measures
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for managing MPE conditions in over-the-air gradient vector aggregation for federated learning. A UE may receive a federated learning model from a base station for participating in a federated learning procedure with the base station. The UE may update the federated learning model for an iteration of the federated learning procedure based on whether an uplink transmission would cause an MPE threshold to be exceeded. The uplink transmission may have a Tx power level that corresponds to a configured Rx power level at the base station. The UE may drop the uplink transmission if the uplink transmission would cause the MPE threshold to be exceeded.