Multi-Base Station Signal Aggregation for CBRS Coverage
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Solution Overview
Problem
Current CBRS architectures face limitations in achieving maximal power and data rates due to restricted EIRP limits, leading to reduced coverage area and data throughput for Category B devices, which are not optimal for providing high-speed data services.
Innovation Solution
A method and apparatus that utilize multiple CBRS base stations to aggregate signals and transmit them to a fixed wireless receiver, allowing for the selection of optimal MIMO antenna elements and beams to achieve higher aggregated received power than a single base station, while adhering to EIRP constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EIRP limits are enforced for Category B devices, then regulatory compliance is maintained, but coverage area and data throughput are reduced
Solution Approach 1:
The patent combines signals from multiple base stations (e.g., CBSDs) to aggregate received power at the user equipment. By merging signals from multiple transmitters, the system achieves higher total power delivery without requiring any single base station to exceed EIRP limits, thus maintaining regulatory compliance while improving data throughput.
Solution Approach 2:
The patent transitions from a single-base-station transmission model to a multi-base-station spatial arrangement. By utilizing multiple spatial dimensions and locations for transmission, the system overcomes the power limitations of individual transmitters while maintaining compliance with EIRP regulations through coordinated transmission from multiple distributed nodes.
2Reliability
If EIRP limits are enforced for Category B devices, then regulatory compliance is maintained, but coverage area is reduced
Solution Approach 1:
The patent merges coverage areas of multiple base stations to provide extended coverage. By combining the transmission ranges of multiple CBSDs, the system achieves broader coverage area while each individual base station operates within its EIRP limits, thus maintaining regulatory compliance.
Solution Approach 2:
The patent extends coverage by utilizing multiple spatial dimensions through distributed base stations. Instead of relying on a single transmitter, the system employs multiple transmitters positioned at different locations, effectively expanding the coverage area through spatial diversity while maintaining EIRP compliance at each node.
3Productivity
If a single base station transmits at maximum power, then data rate is maximized, but coverage area is limited
Solution Approach 1:
The patent combines multiple transmission sources to simultaneously serve users at different distances. By aggregating signals from multiple base stations, the system can provide high data rates to nearby users while also extending coverage to distant users, effectively decoupling the trade-off between data rate and coverage area that exists in single-transmitter systems.
Solution Approach 2:
The patent resolves the data rate versus coverage area trade-off by moving to a multi-dimensional transmission architecture. Multiple base stations positioned at different locations enable the system to deliver high data rates through aggregated power while simultaneously expanding coverage area, as each base station can serve different spatial regions.
4Productivity
If multiple base stations aggregate signals, then received power and data rates increase, but system complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where user equipment reports signal quality and channel conditions to the network. Based on this feedback, the network dynamically selects optimal base stations and signal aggregation configurations, managing system complexity through intelligent control while maximizing data rates through coordinated multi-base station transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances data rates and coverage area for fixed wireless access devices by aggregating power from multiple base stations, overcoming the limitations of single-transmitter systems and achieving higher signal-to-noise ratios.
Implementation Method 1
A method and apparatus for providing service to a fixed wireless receiver in a wireless network is disclosed. The method includes receiving at least two signals at the fixed wireless receiver, the at least two signals transmitted by respective ones of the at least two base stations and corresponding to a common data stream
Data Source
AI summary
Methods and apparatus for managing radio device transmitters, beams, and receivers within a power-limited system. In one embodiment, the methods and apparatus utilize so-called “quasi-licensed” CBRS (Citizens Broadband Radio Service) wireless spectrum in conjunction with a distributed controller architecture that dynamically allocates frequency, base station, and transmit/receive beam resources for delivery of services to a number of installed fixed wireless apparatus (FWA) at user or subscriber premises. The FWA include radio path controller logic that obtains signal data via its antennae and radio head, and transmits the data to a network centralized controller that determines the resource allocation and timing (e.g., via a slotted TDD medium) for service delivery to each FWA. As such, the base stations do not determine the allocations as in the prior art, and multiple power-limited base stations can transmit signals to a single FWA to achieve greater coverage area and/or receive aggregated power.