Split-Spectrum Grant Requests for CBRS Radio Nodes
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Solution Overview
Problem
In shared-license-access bands of frequencies like CBRS, radio nodes face challenges with frequent grant request rejections and revocations due to competition, leading to time-consuming processes and degraded communication performance.
Innovation Solution
A radio node submits multiple grant requests for non-contiguous sub-spectra instead of a single request for the entire bandwidth, increasing the likelihood of approval and reducing the risk of complete service loss if one sub-spectrum is revoked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio node submits a single grant request for the entire desired bandwidth, then the device complexity is reduced, but the probability of approval decreases and time delays increase due to rejection and revocation risks
Solution Approach 1:
The patent divides the desired bandwidth into multiple non-contiguous sub-spectra, each with its own grant request. This segmentation increases the probability that at least one request will be approved, as the SAS is less likely to reject all sub-spectra simultaneously. The radio node manages multiple grant responses and aggregates approved sub-spectra into a single communication channel.
2Reliability
If a radio node submits multiple grant requests for sub-spectra, then the probability of approval increases, but the device complexity and processing overhead increase
Solution Approach 1:
The radio node proactively submits multiple grant requests for different sub-spectra in advance, before needing to establish communication. This preliminary action ensures that at least one grant is likely to be approved, reducing the risk of service interruption and minimizing the time needed to secure bandwidth when communication is required.
Solution Approach 2:
The patent combines multiple approved sub-spectra into a single aggregate communication channel. The radio node aggregates the frequency resources and manages them as one unified channel, simplifying the complexity of handling multiple separate grants while maintaining the benefits of diversified spectrum access.
3Productivity
If the SAS revokes a granted spectrum due to higher priority user requests, then spectrum allocation efficiency is improved, but the radio node experiences service degradation and must repeat the grant request process
Solution Approach 1:
The radio node prepares multiple grant requests for different sub-spectra in advance, creating a cushion against potential revocation of any single grant. If the SAS revokes one granted spectrum due to higher priority users, the radio node already has alternative approved sub-spectra available, preventing service degradation and avoiding the need to repeat the entire grant request process.
Data Source
AI summary
During operation, a radio node may determine a desired bandwidth in a shared-license-access band of frequencies. Then, the radio node may identify two or more sub-spectra based at least in part on the desired bandwidth, where a sum of ranges of frequencies in the sub-spectra equals the desired bandwidth, and a given sub-spectra includes a range of frequencies. Next, the radio node may provide, to the computer, grant requests for the sub-spectra, where a given grant request includes a request to reserve a given one of the sub-spectra for use by the radio node, and a probability of approval of the given grant request is larger than a probability of a grant request for the desired bandwidth. Note that at least two of the sub-spectra may be separated by an intervening band of frequencies (i.e., at least two of the sub-spectra may be non-contiguous).