Adaptive Uplink EIRP Control for Scan-Angle Power Allocation
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Solution Overview
Problem
Conventional satellite communication systems face inefficiencies in uplink power control and resource allocation due to fixed maximum Equivalent Isotropically Radiated Power (EIRP) limits, leading to inefficient utilization of transmit power and resources, especially in scenarios with phased array antennas and carrier aggregation.
Innovation Solution
An adaptive uplink power control system that adjusts EIRP limits based on antenna scan angle and distributes power across multiple carriers, using periodic reporting of scan angles and open loop power control to optimize power spectral density (PSD) and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed maximum EIRP limits are used for uplink power control, then regulatory compliance is ensured, but transmit power utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of EIRP limits and PSD masks based on real-time antenna scan angles. Instead of using fixed EIRP limits, the system continuously adapts the maximum EIRP and corresponding PSD limits according to the actual antenna orientation, allowing the power spectral density mask to be dynamically recalculated and applied. This resolves the contradiction by maintaining regulatory compliance through adaptive control while maximizing transmit power utilization through real-time optimization.
Solution Approach 2:
The system changes the parameters of EIRP limits and PSD masks based on antenna scan angle variations. When the scan angle changes, the maximum EIRP parameter is recalculated, and consequently the PSD limit parameters are adjusted to maintain compliance. This parameter adaptation allows the system to operate at optimal power levels for each antenna orientation, improving transmit power efficiency while ensuring regulatory requirements are met.
2Reliability
If fixed PSD limits are applied to accommodate maximum EIRP variations, then regulatory compliance is maintained, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the antenna scan angle is continuously monitored, and this information feeds back into the power control system. The scan angle measurement triggers recalculation of the maximum EIRP and PSD limits, creating a closed-loop control system. This feedback approach ensures regulatory compliance is maintained while resource allocation is continuously optimized based on actual antenna conditions, resolving the contradiction between compliance and efficiency.
Solution Approach 2:
The system performs preliminary calculation of maximum EIRP and PSD limits based on anticipated or current scan angles before actual transmission occurs. By pre-calculating the appropriate power limits based on antenna orientation, the system is prepared to allocate resources efficiently from the outset, avoiding suboptimal resource allocation that would occur with fixed limits.
3Adaptability or versatility
If independent power control is performed for each carrier in carrier aggregation, then carrier-specific optimization is achieved, but overall power utilization efficiency deteriorates
Solution Approach 1:
The patent merges the power control functions across multiple carriers by implementing a unified EIRP limit and a single PSD mask that applies to the aggregate transmit power across all carriers. Instead of maintaining separate EIRP limits and PSD masks for each carrier, the system consolidates these controls, allowing power to be optimally distributed across carriers based on overall system conditions and antenna scan angle, thereby improving overall power utilization efficiency while maintaining carrier-specific adaptability.
Data Source
AI summary
An adaptive transmit power control process enables the uplink transmit power of a user terminal to be adjusted based on a scan angle of the antenna for the user terminal. The antenna periodically reports the scan angle to the user terminal, and a current maximum transmit power for the user terminal is determined based on the scan angle. The current maximum transmit power is then used as the basis for determining an allocation of resources to the user terminal. The transmit power control process enables resources to be assigned as needed across multiple carriers and enables a power spectral density of a user terminal to be adjusted based on nominal and offset transmit power parameters.