Partial Spectrum Evacuation in CBRS Base Stations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in managing signal interference, particularly in shared frequency bands like CBRS, where protecting higher-priority devices such as FSS requires precise control of transmission power to avoid interfering with them, while maintaining service to users in non-interfering spatial ranges.
Innovation Solution
Implementing a method where base stations divide their steering range into interfering and non-interfering spatial ranges, adjusting maximum EIRP levels accordingly, and using a Spectrum Access System to manage these settings to ensure aggregate interference remains below thresholds, allowing for precise coverage shaping and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations transmit at maximum power in all spatial ranges, then service quality and data rate are improved, but interference to protected devices (e.g., FSS) increases
Solution Approach 1:
The patent segments the spatial range into interfering spatial ranges and non-interfering spatial ranges. The base station transmits at first maximum power in non-interfering ranges while transmitting at reduced second maximum power in interfering ranges, thereby maintaining service quality where possible while protecting vulnerable devices from interference.
Solution Approach 2:
The patent applies different power transmission qualities to different spatial regions. Instead of uniform power transmission, the system transmits at higher power levels in directions away from protected devices and at lower power levels in directions toward protected devices, optimizing both service quality and interference reduction locally in each spatial range.
2Object-affected harmful factors
If base stations reduce transmission power to protect higher-priority devices, then interference is reduced, but service quality and productivity in non-interfering areas deteriorate
Solution Approach 1:
The spatial transmission range is segmented into interfering and non-interfering portions. The system maintains maximum transmission power in non-interfering spatial ranges to preserve productivity and service quality, while applying power reduction only in interfering spatial ranges where protected devices are located.
Solution Approach 2:
The system applies partial power reduction action only where necessary (in interfering spatial ranges) rather than reducing power uniformly across all directions. This partial action approach maintains excessive (maximum) power transmission in non-interfering areas to preserve productivity while still achieving interference reduction where needed.
3Device complexity
If uniform maximum power transmission is used, then device complexity is minimized, but measurement precision of interference impact is insufficient
Solution Approach 1:
The system implements feedback mechanisms where the base station receives information from a frequency allocation arbitrator about which spatial ranges are interfering and what power levels are appropriate. This feedback enables precise measurement and control of interference impact while managing complexity through automated decision-making based on received parameters.
Data Source
AI summary
Various techniques are provided for spectrum allocation. A method can include receiving a message including a first maximum power setting, a second maximum power setting, and a spatial range associated with the second maximum power setting, transmitting at least one first beam within the first maximum power in a spatial range excluding the spatial range associated with the second maximum power setting, and transmitting at least one second beam within the second maximum power in the spatial range associated with the second maximum power setting.