Subarray Antenna EIRP Masks for Altimeter Interference Control
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Solution Overview
Problem
Interference from terrestrial cellular network nodes with airplane radio altimeters and satellite services due to emissions in overlapping frequency ranges poses safety and performance issues, particularly in frequency bands like FR2 and future FR3 spectrum allocations.
Innovation Solution
A configuration for equivalent isotropic radiated power (EIRP) mask properties based on subarray antenna architectures is implemented to minimize interference by setting thresholds for average and maximum EIRP, adjusting transmission parameters, and employing measures such as power backoff and beam broadening to ensure compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terrestrial cellular network nodes transmit in frequency bands overlapping with airplane radio altimeters and satellite services, then communication capacity and coverage are improved, but interference to existing services occurs causing safety and performance issues
Solution Approach 1:
The patent applies local quality by implementing direction-dependent EIRP limits through 3D beamforming. Different EIRP thresholds are applied to different spatial directions: stricter limits for directions toward airplane radio altimeters and satellite services, and more relaxed limits for other directions. This allows the system to maintain high communication capacity in safe directions while protecting vulnerable services from interference.
Solution Approach 2:
The patent changes the EIRP parameter dynamically based on transmission conditions. The base station adjusts EIRP values according to the target direction, user location, and service type. By modifying EIRP parameters in real-time, the system optimizes communication performance while preventing interference to critical services in specific directions.
2Power
If EIRP transmission power is increased to improve signal coverage and capacity, then communication performance is improved, but interference to coexisting services increases
Solution Approach 1:
The patent implements dynamic EIRP adjustment through 3D beamforming technology. The system continuously adapts transmission parameters based on real-time channel conditions, user locations, and interference assessments. This dynamic approach allows the base station to transmit at high power when safe and reduce power when potential interference is detected, optimizing both communication performance and interference mitigation.
Solution Approach 2:
The system employs feedback mechanisms to monitor transmission effects and adjust EIRP accordingly. By receiving information about user equipment locations, channel conditions, and potential interference scenarios, the base station can make informed decisions about EIRP levels, ensuring communication effectiveness while preventing harmful emissions to protected services.
3Ease of manufacture
If conventional EIRP mask specifications are applied without considering subarray antenna architecture, then implementation is simpler, but accurate interference mitigation cannot be achieved
Solution Approach 1:
The patent segments the antenna array into multiple subarrays, each capable of independent beamforming control. This segmentation allows the system to apply different EIRP masks to different subarrays based on their specific radiation patterns and interference potential. While more complex than conventional approaches, this segmentation enables precise interference mitigation by targeting specific spatial regions with appropriate EIRP limits.
Data Source
AI summary
Method and apparatus for EIRP mask specifications with subarray antenna architectures. The apparatus selects at least one transmission configuration parameter of an antenna array based on an EIRP threshold including one or more of an average EIRP over multiple subarray architecture parameters or a maximum EIRP for each of the multiple subarray architecture parameters. The apparatus transmits based on the at least one transmission configuration parameter. The apparatus may measure at least one of the average EIRP or the maximum EIRP based on the selected at least one transmission configuration parameters. The apparatus may compare the selected at least one transmission configuration parameters with a configured set of acceptable parameters or non-acceptable parameters.