Spectrum Revocation Curves for Seamless CBRS Migration
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Solution Overview
Problem
Spectrum grant revocations in wireless communications systems, such as those using Citizens Broadband Radio Service (CBRS), often result in disruptive network service disruptions due to the need for CBSDs to reboot and re-request spectrum grants, which can take up to 15 minutes, causing non-seamless service delivery.
Innovation Solution
Implementing a Spectrum Access System (SAS) that uses dynamically determined spectrum revocation curves to gradually reduce the use of revoked spectrum by CBSDs over time, allowing for controlled spectrum migration without rebooting, based on traffic type, importance, and network conditions, thereby minimizing Quality of Service (QoS) impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spectrum grant revocation is implemented immediately, then spectrum resource allocation efficiency is improved, but network service continuity deteriorates
Solution Approach 1:
The system performs preliminary actions by notifying CBSDs of upcoming spectrum revocations in advance and providing them with alternative spectrum resources before the revocation occurs. This allows CBSDs to prepare for the transition without service interruption, resolving the contradiction between efficient spectrum reallocation and service continuity.
Solution Approach 2:
The Spectrum Access System acts as an intermediary between the spectrum management authority and CBSDs, coordinating the spectrum transition process. It manages the timing and execution of spectrum revocations while ensuring CBSDs have alternative resources ready, thereby maintaining service continuity during spectrum reallocation.
2Extent of automation
If CBSD reboot is required for spectrum re-grant, then spectrum grant management control is improved, but service delivery time increases
Solution Approach 1:
The system ensures continuity of useful action by providing CBSDs with alternative spectrum resources that allow uninterrupted service delivery. CBSDs can continue operating on alternative spectrum while the original spectrum is revoked, eliminating the need for reboot and maintaining continuous service.
Solution Approach 2:
Alternative spectrum resources are allocated to CBSDs in advance before the original spectrum is revoked. This preliminary allocation ensures that CBSDs can seamlessly switch to alternative resources without rebooting, maintaining service continuity while still enabling spectrum grant management.
3Speed
If spectrum revocation is performed abruptly, then spectrum resource reallocation speed is improved, but Quality of Service deteriorates
Solution Approach 1:
The system performs preliminary allocation of alternative spectrum resources to CBSDs before the original spectrum is revoked. This advance preparation allows for rapid spectrum reallocation without abruptly impacting QoS, as CBSDs can transition smoothly to alternative resources.
Solution Approach 2:
The Spectrum Access System mediates the transition by coordinating the timing of spectrum revocation with the availability of alternative resources. It ensures that CBSDs have alternative spectrum ready before switching, thereby maintaining QoS during the reallocation process while achieving fast spectrum resource reallocation.
Data Source
AI summary
Various embodiments comprise systems, methods, and apparatus configured to implement citizens broadband radio service (CBRS) spectrum grant revocations by one or more Spectrum Access Systems (SASs) of some or all of spectrum already granted to the Citizens Broadband Radio Service Devices (CBSDs) in a controlled manner in accordance with one or more spectrum revocation curves (SRCs) determined by the SAS which define, for enabled CBSD, respective portions of granted spectrum to be revoked as a function of time wherein the shape of an SRC for a CBSD may selected based upon the type of CBSD traffic, the relative importance of that traffic with respect to that of other CBSDs, and other factors.