Dynamic ESC Protection in CBRS Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for protecting Environmental Sensing Capability (ESC) in Citizens Broadband Radio Service (CBRS) systems from interference create a dead zone that limits spectral efficiency by severely restricting CBSD transmissions near ESC sensors to prevent exceeding a specific signal threshold, thereby reducing the utilization of the 3.5 GHz band.
Innovation Solution
A system that uses a spectrum access system (SAS) to control CBSD grants such that the aggregate mean signal energy does not exceed an overload threshold of −99 dBm/MHz, allowing the ESC to trigger a move list operation, where CBSDs either suspend transmission or move to a different frequency channel when the aggregate signal energy exceeds this threshold, thereby balancing interference protection with spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESC protection methods are used to prevent excess interference, then ESC protection is improved, but spectral efficiency deteriorates due to dead zone restrictions on CBSD transmissions
Solution Approach 1:
The patent changes the protection threshold parameter from a fixed strict limit to a dynamic threshold based on RADAR signal detection. The SAS adjusts the aggregate signal energy threshold depending on whether RADAR signals are detected, allowing more flexible CBSD transmissions when no RADAR is present while maintaining protection when RADAR signals are detected. This parameter change resolves the contradiction by making the protection level adaptive rather than static.
Solution Approach 2:
The patent introduces dynamic behavior to the ESC protection mechanism. The protection threshold and CBSD transmission restrictions are no longer static but change dynamically based on RADAR signal detection status. When RADAR signals are detected, strict protection is applied; when not detected, more flexible transmissions are allowed. This dynamic approach eliminates the permanent dead zone while maintaining reliability when needed.
2Object-affected harmful factors
If strict signal thresholds are enforced to protect ESC, then interference protection is improved, but CBSD transmission flexibility deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the ESC continuously monitors for RADAR signals and reports detection status to the SAS. The SAS uses this feedback to dynamically adjust CBSD transmission permissions. When feedback indicates RADAR signals are present, strict interference protection is enforced; when feedback indicates no RADAR signals, CBSDs gain transmission flexibility. This feedback loop resolves the contradiction by making protection adaptive to actual conditions rather than uniformly strict.
Solution Approach 2:
The patent changes the interference protection parameter from a fixed strict threshold to a dynamic threshold that varies based on RADAR detection. The aggregate signal energy threshold is adjusted according to the presence or absence of RADAR signals, allowing the system to maintain interference protection when needed while providing transmission flexibility when the environment is safe. This parameter adaptation resolves the contradiction between protection and flexibility.
3Measurement precision
If CBSD transmissions are restricted near ESC sensors, then ESC detection accuracy is improved, but spectrum utilization deteriorates
Solution Approach 1:
The patent introduces dynamic control to the CBSD transmission restrictions near ESC sensors. Instead of permanent static restrictions creating dead zones, the system dynamically adjusts transmission permissions based on real-time RADAR signal detection. When RADAR signals are detected, transmissions are restricted to maintain detection accuracy; when not detected, transmissions are permitted to improve spectrum utilization. This dynamic approach resolves the contradiction by making restrictions conditional rather than permanent.
Solution Approach 2:
The patent implements a feedback mechanism where the ESC monitors the electromagnetic environment for RADAR signals and provides this information to the SAS, which then adjusts CBSD transmission permissions. This feedback loop ensures that detection accuracy is maintained when RADAR signals are present while allowing full spectrum utilization when the environment is clear. The feedback-driven approach resolves the contradiction by linking transmission restrictions to actual detection needs rather than applying uniform restrictions.
Data Source
AI summary
A system for ESC protection includes a spectrum access system (SAS) configured to allocate a frequency band in the system and at least one Citizens Broadband Radio Service device (CBSD) communicatively coupled to the SAS and configured to provide wireless service to UEs. The system also includes at least one ESC communicatively coupled to the SAS and configured to detect RADAR signals from offshore RADAR devices. The SAS is configured to assign grants to the at least one CBSD such that the aggregate signal energy received at the ESC does not cross an overload threshold, as calculated by the SAS. The ESC is configured to detect an aggregate signal energy received at the ESC, and trigger, in response to the aggregate signal energy exceeding the overload threshold, an operation that suspends transmission of at least one CBSD or moves at least one CBSD to a different frequency channel.