Local SAS for Private Network Spectrum Continuity
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Solution Overview
Problem
Private enterprise networks face disruptions due to the unavailability of geo-redundant spectrum access systems (SAS) caused by failures or attacks, leading to service downtime and potential mission-critical interruptions, as they are required to vacate spectrum bands quickly to protect incumbents, limiting their operational time to 240 seconds.
Innovation Solution
Implementing a local SAS at a domain proxy that responds to heartbeat messages from Citizens Broadband radio Service Devices (CBSDs), attempts to establish connections with environmental sensing capabilities, and switches channels if overlap with dynamic protection areas, allowing continued operation by aggregating traffic and managing channel assignments to extend operational windows beyond initial limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CBSDs use geo-redundant SAS instances for spectrum allocation, then service reliability is improved, but operational continuity deteriorates when SAS becomes unavailable
Solution Approach 1:
A local SAS instance is deployed at the domain proxy to act as an intermediary between CBSDs and the central SAS. When the central SAS becomes unavailable, the local SAS instance continues to respond to heartbeat messages and manage spectrum allocations, preventing service interruption and extending operational continuity beyond the 240-second limit.
Solution Approach 2:
The centralized SAS function is segmented into multiple independent instances distributed across different locations (central SAS and local SAS instances). This segmentation allows the system to maintain spectrum management capabilities even when the central SAS is unavailable, as local instances can independently continue operations.
2Object-affected harmful factors
If CBSDs are required to vacate spectrum bands quickly to protect incumbents, then incumbent protection is improved, but service availability deteriorates
Solution Approach 1:
The local SAS instance is pre-configured with spectrum allocation data and incumbent protection rules before the central SAS becomes unavailable. When incumbents are detected or the central SAS is down, the local SAS can immediately execute pre-planned channel switches and power adjustments, maintaining both incumbent protection and service availability without the 240-second delay.
3Duration of action of moving object
If a local SAS is instantiated at the domain proxy, then operational window is extended, but system complexity increases
Solution Approach 1:
Instead of creating a completely new complex system, the local SAS instance is implemented as a simplified copy of the central SAS functionality at the domain proxy. It replicates only the essential spectrum management operations (heartbeat response, channel allocation, incumbent protection) needed to maintain service during central SAS outages, extending the operational window while minimizing the increase in system complexity.
Data Source
AI summary
An apparatus such as a domain proxy implemented in an edge cloud of a private enterprise network includes a processor configured to aggregate traffic for Citizens Broadband radio Service Devices (CBSDs) in a private enterprise network. The apparatus also includes a transceiver configured to monitor communication with geo-redundant instances of a spectrum access system (SAS) that allocate frequency bands in a shared spectrum to the CBSDs. The processor is configured to instantiate a local SAS in response to the geo-redundant instances of the SAS becoming unavailable. The local SAS is configured to respond to heartbeat messages from the CBSDs. The local SAS is also configured to attempt to establish a connection with an environmental sensing capability (ESC) in response to the geo-redundant SASs becoming unavailable.