Reliability Analysis of a Channel Restoration Mechanism for Opportunistic Spectrum Access
Bibliographic record
Abstract
In this paper, we analyze the promising yet mostly unexplored ability of opportunistic spectrum access (OSA) based on cognitive radios (CR) to provide a robust infrastructure for wireless networks operating in challenging environments with frequent transmission link disruptions. We consider a general network model where the CR users can utilize spectrum sensing and channel switching to determine the status of a channel and use a restoration process when a link failure occurs. We first classify the reliability metrics in CR networks based on the perspective and severity of the failures. We then derive analytical relations for the mean time to failure (MTTF) and mean time to repair (MTTR) of the CR users. With the proposed OSA channel restoration scheme, we show that the MTTF between hard failures, where a user cannot communicate for a long interval, increases exponentially with the number of channels available to the CR users. When a failure occurs, the MTTR also decreases exponentially with the number of channels, thereby providing a highly robust communication environment. Finally, we provide design guidelines that can be used to evaluate the tradeoffs between the number of users and channels versus the required reliability.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".