Time-Interleaved Coverage Zones in CBSD Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in dynamically allocating spectrum to efficiently support diverse wireless devices in Citizens Broadband Radio Service (CBRS) networks, particularly in managing spectrum access and optimizing coverage zones to meet varying device requirements.
Innovation Solution
The solution involves creating coverage zones at Citizens Broadband Radio Service Device (CBSD) nodes by assigning unique Physical Layer Cell Identities (PCI) and allocating specific time slots to each zone, allowing different types of wireless devices to communicate through a Spectrum Access System (SAS) managed provider equipment, ensuring efficient use of available bandwidth across multiple sectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single PCI is transmitted from all sectors simultaneously, then spectrum utilization is simplified, but diverse device requirements cannot be met
Solution Approach 1:
The patent segments the coverage area into multiple coverage zones, each associated with a different PCI. Instead of using a single PCI for all sectors, the system divides the service area into distinct zones (e.g., Zone 1 with PCI-1, Zone 2 with PCI-2) and assigns specific PCIs to specific zones. This segmentation allows different device types to be served by different PCIs while maintaining manageable complexity through systematic zone-based organization.
Solution Approach 2:
The patent implements dynamic PCI assignment where the system can adaptively allocate different PCIs to different coverage zones based on real-time device type detection and service requirements. The network can dynamically adjust which PCI is transmitted from which sector depending on the detected device type, enabling flexible adaptation to diverse device requirements while maintaining operational simplicity through automated control.
2Reliability
If spectrum is allocated for each device type, then service quality improves, but spectrum access management becomes complex
Solution Approach 1:
The patent implements periodic time-slot allocation where different PCIs are transmitted in alternating time slots from different sectors. For example, PCI-1 is transmitted from Sector 1 during Time Slot 1, while PCI-2 is transmitted from Sector 2 during Time Slot 2, and this pattern repeats periodically. This periodic structure ensures reliable service for different device types while simplifying spectrum management through predictable, repeating patterns that are easy to coordinate and control.
Solution Approach 2:
The patent maintains continuous spectrum utilization by ensuring that while one PCI is being transmitted from one sector, another PCI is simultaneously transmitted from another sector. This continuous operation across multiple sectors and PCIs ensures that spectrum resources are always being productively used to serve different device types, maintaining high service quality while avoiding idle spectrum periods that would complicate management.
3Adaptability or versatility
If multiple PCIs are transmitted simultaneously from all sectors, then diverse device support is achieved, but interference increases
Solution Approach 1:
The patent uses periodic time-slot allocation to transmit different PCIs from different sectors at different times. During Time Slot 1, PCI-1 is transmitted from Sector 1 while Sector 2 remains silent or transmits a different PCI. During Time Slot 2, PCI-2 is transmitted from Sector 2 while Sector 1 transmits differently. This time-division approach allows multiple PCIs to coexist without simultaneous interference, achieving diverse device support while eliminating harmful interference through temporal separation.
Solution Approach 2:
The patent segments both the physical coverage area and the time domain to assign different PCIs to different space-time regions. By dividing the coverage area into distinct zones and assigning specific time slots to specific zones, the system ensures that signals from different PCIs do not overlap in both space and time simultaneously. This dual segmentation approach minimizes interference between coverage zones while maintaining the ability to support multiple device types through different PCI assignments.
Data Source
AI summary
Various embodiments comprise systems, methods, architectures, mechanisms and apparatus for creating coverage zones (CZs) at a Citizens Broadband Radio Service Device (CBSD) nodes where each CZ is defined by a respective Physical layer Cell Identity (PCI), and each CZ is allocated a respective time slot having a duration selected in accordance with a type of wireless device (WD) to be supported by the CZ, and each CZ communicates during its respective time slot via some or all of the antennas or antenna sections (e.g., coverage areas or sections S1-S3) of the node such that the node communicates with different types of WD in a time-interleaved manner via some or all of the coverage areas associated with the node.