UE Transmit Port Selection Under SAR and MPE Constraints
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Solution Overview
Problem
Existing wireless communication systems face challenges in dynamically selecting the number of transmit ports to optimize throughput while adhering to specific absorption rate (SAR) and maximum permissible exposure (MPE) limits, leading to potential throughput loss due to RF exposure constraints.
Innovation Solution
A user equipment (UE) dynamically selects the number of transmit ports based on traffic type and SAR/MPE parameters, enabling or disabling X-port transmission to balance throughput and RF exposure, using monitoring mechanisms for NE usage, input power limits, and uplink duty cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transmit ports is increased to optimize throughput, then data transmission rate is improved, but RF exposure (SAR/MPE) increases beyond regulatory limits
Solution Approach 1:
The patent implements dynamic selection of transmit port configuration based on real-time traffic conditions and RF exposure monitoring. The system transitions between different transmit port modes (e.g., 1-port, 2-port, 4-port) adaptively, allowing the configuration to change over time rather than being fixed. This resolves the contradiction by enabling high throughput when RF exposure permits and reducing transmit ports when exposure limits are approached.
Solution Approach 2:
The system changes the parameter of transmit port configuration (number of active ports) based on monitored conditions including traffic type, RF exposure levels, and duty cycle. By dynamically adjusting this parameter, the system optimizes throughput while maintaining compliance with SAR/MPE limits, resolving the trade-off between data rate and RF exposure.
2Productivity
If transmit power is increased to improve data rate, then throughput is improved, but compliance with SAR and MPE limits becomes difficult to maintain
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors RF exposure metrics (SAR/MPE), transmit power levels, and traffic conditions. Based on this feedback, the system dynamically adjusts the transmit port configuration to maintain both high data rates and regulatory compliance. The feedback loop ensures that when exposure limits are approached, the system responds by adjusting parameters to remain compliant.
Solution Approach 2:
The system performs preliminary identification of traffic type and selection of appropriate transmit port configuration before actual transmission begins. By pre-configuring the transmit ports based on anticipated traffic conditions and current RF exposure status, the system proactively ensures compliance while optimizing for data rate, rather than reacting after violations occur.
3Productivity
If X-port transmission is enabled to maximize throughput, then productivity increases, but system complexity increases due to monitoring and selection mechanisms
Solution Approach 1:
The patent implements a unified transmit port selection mechanism that handles multiple functions: traffic type identification, RF exposure monitoring, duty cycle tracking, and transmit port configuration selection. This multi-functional approach consolidates what could be separate complex systems into a single integrated mechanism, reducing overall system complexity while maintaining high throughput capability through adaptive port selection.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a traffic type of an uplink communication. The UE may identify one or more specific absorption rate (SAR) or maximum permissible exposure (MPE) parameters for a time window. The UE may identify, from among a plurality of candidate numbers of transmit ports, based at least in part on the traffic type and the one or more SAR or MPE parameters, a number of transmit ports for transmission of the uplink communication. The UE may transmit the uplink communication using the number of transmit ports. Numerous other aspects are described.