Carrier Aggregation Power Control Under MPR Emission Constraints
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Solution Overview
Problem
Existing 3GPP specifications lack definitions for transmit RF characteristics, such as MPR and spurious emission limits, for high-power UE configurations like Power Class 1.5, preventing compliant operation under regulatory constraints and limiting their deployment and performance in 5G NR systems.
Innovation Solution
Devices and methods for high-power UEs determine intra-band carrier aggregation type and corresponding MPR values based on power class and regulatory emission requirements, applying additional measures like power-dependent MPR and uplink duty cycle control to ensure compliance with emission and SAR limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power UE configurations (Power Class 1.5) are deployed to increase transmit power and data rate, then communication performance is improved, but regulatory compliance and deployment are prevented due to lack of MPR and emission limit definitions
Solution Approach 1:
The patent introduces new parameters (MPR values, emission limits, duty cycle constraints) that change the operational parameters of high-power UEs. By defining specific MPR values for different CA configurations and power classes, the system enables regulatory compliance while maintaining high transmit power capability.
Solution Approach 2:
The patent implements dynamic power control mechanisms where UEs adjust their transmit power based on real-time conditions including MPR calculations, SAR limits, and duty cycle constraints. This dynamic adaptation allows high-power UEs to operate compliantly across varying network conditions and deployment scenarios.
2Productivity
If intra-band carrier aggregation is used to increase data rate, then communication performance is improved, but device complexity increases due to need to determine contiguous/non-contiguous CA types and apply different MPR values
Solution Approach 1:
The patent segments the CA configuration space into distinct categories (contiguous vs. non-contiguous CA, different power classes) and assigns specific MPR values to each segment. This segmentation approach simplifies the decision-making process by providing clear rules for different scenarios rather than requiring complex unified calculations.
Solution Approach 2:
The patent changes the operational parameters based on CA configuration type by introducing different MPR values for contiguous versus non-contiguous CA scenarios. This parameter adaptation allows the system to maintain high data rates while managing complexity through predefined rules for each configuration type.
3Productivity
If maximum transmit power is increased to meet high data rate demands, then productivity is improved, but harmful emissions and SAR exposure increase requiring additional power reduction measures
Solution Approach 1:
The patent applies multiple parameter changes including MPR, additional MPR (A-MPR), and power-dependent MPR (P-MPR) to dynamically adjust transmit power. These parameter modifications enable the system to operate at high power levels while compensating for harmful emissions and SAR exposure through calculated power reductions.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously monitors and reports on power class, CA configuration, and emission constraints to the network. This feedback loop enables dynamic power adjustment to balance high data rate requirements with emission and SAR compliance.
Data Source
AI summary
A device may include one or more processors and a transmitter that performs an intra-band carrier aggregation (CA). The one or more processors may be configured to determine, as a first determination result, whether the CA is contiguous or non-contiguous. The one or more processors may be configured to identify, based at least on a power class of the device and the first determination result, an amount of maximum power reduction (MPR) of the device. The transmitter may be configured to transmit data using the identified amount of MPR of the device.