CBSD Power Management via Incremental Adjustments
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Solution Overview
Problem
Citizens Broadband Radio Service (CBRS) networks face challenges in accurately estimating CBSD coverage and efficiently allocating resources, leading to disruptions in service quality and user equipment devices due to abrupt power transmission level changes, causing interference and service interruptions.
Innovation Solution
The method involves using power headroom, channel quality indicator, and path loss model information to gradually adjust CBSD transmission power levels, primarily affecting cell edge user equipment devices, thereby minimizing service disruptions and optimizing coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the SAS sends transmit power change commands to CBSD devices, then the overall efficiency of spectrum use is improved, but the quality of service and number of user equipment devices affected deteriorate due to abrupt power transmission level changes
Solution Approach 1:
The patent segments the power transmission level change into multiple incremental steps rather than a single abrupt change. The CBSD gradually adjusts its transmit power level through a series of smaller adjustments, each followed by monitoring of UE impact metrics, thereby achieving the required power reduction while minimizing service disruptions to user equipment devices.
Solution Approach 2:
The patent implements a dynamic power adjustment mechanism where the CBSD continuously monitors the impact of power changes on connected UEs and adapts its transmit power level accordingly. The system dynamically determines the optimal power reduction step size based on real-time network conditions and UE characteristics, allowing flexible optimization between spectrum efficiency and service quality.
2Speed
If the CBSD decreases transmit power level in a single step, then the power transmission level changes are implemented quickly, but a large number of user equipment devices are dropped or have their quality of service impacted
Solution Approach 1:
The patent divides the total power reduction requirement into multiple smaller incremental steps. Instead of implementing a single large power reduction that would cause UE drops, the system applies several smaller power reductions sequentially, with each step being small enough to maintain UE connectivity while collectively achieving the desired power level reduction.
Solution Approach 2:
The patent performs preliminary assessment of the network conditions and UE characteristics before initiating power reduction. The system evaluates which UEs are most sensitive to power changes and prioritizes maintaining their service continuity, allowing the power reduction to proceed in a controlled manner that protects vulnerable connections.
3Area of stationary object
If multiple CBSDs in a cluster increase transmission power at the same time, then the coverage area is expanded, but unanticipated interference occurs across the CBSDs coverage area
Solution Approach 1:
The patent implements periodic coordination and adjustment of power levels among multiple CBSDs in a cluster. Rather than allowing simultaneous independent power increases that cause interference, the system uses periodic signaling and coordination to stagger power adjustments, monitor interference levels, and adjust individual CBSD power levels in a coordinated sequence that expands coverage while minimizing mutual interference.
4Area of stationary object
If a large increase in transmission power of a CBSD is implemented, then the coverage range is extended quickly, but a large number of UE devices come within coverage range and flood the CBSD with registration requests
Solution Approach 1:
The patent segments the coverage expansion into incremental power increase steps. Instead of a single large power increase that would cause a sudden influx of UEs flooding the CBSD, the system applies smaller power increases sequentially, allowing the network to gradually accommodate new UEs and their registration requests without overwhelming the CBSD's processing capacity.
Data Source
AI summary
Methods and apparatus for managing the power transmit level of Citizens Broadband Radio Service Devices (CBSDs) in a Citizens Broadband Radio Service Network. In an exemplary method embodiment a CBSD is operated to: (i) receive from a Spectrum Access System one or more of: (a) a power headroom threshold value used to identify cell edge user equipment devices (UEs) or (b) a channel quality indicator threshold value used to identify cell edge user equipment devices; receive a power down command from the SAS; (ii) identify based on one or more of the received power headroom threshold value and the received channel quality indicator threshold value cell edge UEs being serviced by the CBSD; and (iii) decrease transmit power of the CBSD by an estimated amount of transmit power required to support the identified cell edge UEs.