CBRS Device Sensing and Power Regulation
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Solution Overview
Problem
The Citizens Broadband Radio Service (CBRS) band's shared usage poses challenges in ensuring that priority users, such as the United States Navy, are not subjected to harmful interference, limiting the deployment of wireless broadband infrastructure near coastal areas where Navy use is expected.
Innovation Solution
Implementing sensors in user equipment and base stations to scan the CBRS band, generate sensor data on energy levels and user identity, and adjust transmission power and channel selection to avoid interfering with priority users, ensuring compliance with Federal Communications Commission rules and allowing flexible wireless broadband use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are implemented in user equipment and base stations to scan the CBRS band and adjust transmission power, then harmful interference to priority users is prevented, but device complexity increases
Solution Approach 1:
The system performs sensing operations before transmission to identify incumbent users and determine appropriate transmission parameters. This preliminary detection and classification of users (Incumbent Access, Priority Access, General Authorized Access) allows the system to pre-calculate safe transmission power levels and channel selections, preventing harmful interference before it occurs rather than reacting to it
Solution Approach 2:
The system continuously monitors the CBRS band for energy levels and user presence, using this feedback to dynamically adjust transmission power and channel selection. The sensing module provides real-time information about incumbent users and channel occupancy, which feeds back to the transmission controller to modify transmission parameters, creating a closed-loop system that adapts to changing spectral conditions
2Reliability
If transmission power is reduced to avoid interfering with priority users, then compliance with FCC rules is achieved, but broadband access performance deteriorates
Solution Approach 1:
The system applies different transmission power levels and channel selections to different spatial locations and frequency channels based on local spectral conditions. When incumbent users are detected in certain channels or geographic areas, the system locally adjusts transmission parameters for those specific channels/locations while maintaining full power on other channels where no incumbents are present, optimizing performance without violating FCC rules
Solution Approach 2:
The system dynamically changes transmission parameters including power level, frequency channel, and time of transmission based on sensed conditions. The sensing module detects incumbent user presence and triggers parameter adjustments such as reducing power to specific levels, switching to alternative channels, or deferring transmission until incumbents move, thereby achieving FCC compliance while maintaining overall system throughput through adaptive parameter optimization
3Reliability
If continuous scanning of the CBRS band is performed to detect priority users, then harmful interference is prevented, but energy consumption increases
Solution Approach 1:
Instead of continuous scanning, the system performs sensing operations periodically at intervals appropriate to the mobility and behavior patterns of incumbent users. The sensing can be triggered by events such as attempted transmissions, changes in spectral conditions, or scheduled intervals, reducing energy consumption while maintaining reliable detection of priority users through periodic sampling of the CBRS band
Solution Approach 2:
User equipment and base stations autonomously perform sensing and classification operations without requiring continuous external control or coordination. The system self-manages the sensing schedule, energy consumption, and transmission decisions based on local conditions, making efficient use of available energy by performing sensing only when necessary to maintain reliable operation and compliance
Data Source
AI summary
Wireless transmission regulation for a frequency band associated with Citizens Broadband Radio Service (CBRS) is described. In an example, a sensor associated with a device, which is configured to operate in the frequency band, can scan at least a portion of the frequency band to generate sensor data indicating at least energy present in the portion of the frequency band. The device can determine, based at least in part on analyzing the sensor data, a presence of another device utilizing the frequency band. The other device can be a priority user having priority access over the device. The device can transmit the sensor data to a base station that is configured to analyze the sensor data and determine how to transmit one or more communications within the frequency band, based at least in part on the sensor data and subscriber information associated with subscriber(s) of a telecommunications service.