Small-Cell Scheduler Fairness via CQI Randomization
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Solution Overview
Problem
Existing wireless network systems, particularly those using small-cell CBRS technology, face issues with fairness in data traffic scheduling, leading to unequal allocation of backhaul bandwidth among fixed wireless access (FWA) devices, resulting in inconsistent quality of service due to static channel conditions and reliance on inaccurate Channel Quality Indicators (CQI) reports.
Innovation Solution
A method and apparatus that adjust the configuration of wireless premises devices by calculating standard deviations of CQI values over time, evaluating channel stability, and dynamically adjusting Modulation and Coding Scheme (MCS) and transport block size (TBS) to optimize data delivery, while also randomizing CQI reporting to ensure more equitable resource allocation and improved channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bandwidth allocation is based on individual channel conditions using CQI reports, then data transmission efficiency is improved, but fairness among multiple FWA devices deteriorates due to static channel conditions
Solution Approach 1:
The patent applies dynamics by making the CQI values dynamic rather than static. The base station randomizes CQI reports from FWA devices and dynamically adjusts MCS indices based on these randomized values, allowing the system to adapt channel conditions artificially to achieve both efficiency and fairness in bandwidth allocation
Solution Approach 2:
The patent changes the parameter of CQI values by randomizing them within a certain range. This parameter change transforms the static channel quality indication into a dynamic one, enabling the scheduler to allocate bandwidth more fairly while maintaining transmission efficiency through adjusted MCS indices
2Measurement precision
If CQI reporting is used for scheduling decisions, then channel quality information is obtained, but scheduling overhead increases and resource utilization deteriorates
Solution Approach 1:
The patent applies partial action by using randomized CQI values rather than complete and frequent CQI reporting. This reduces the overhead of CQI reporting while still providing sufficient channel quality information for scheduling decisions, thereby reducing time loss and improving resource utilization
Data Source
AI summary
Methods and apparatus for enhancing packet scheduler fairness in a small-cell wireless communication network. In one embodiment, the methods and apparatus utilize “quasi-licensed” CBRS (Citizens Broadband Radio Service) wireless spectrum in conjunction with 3GPP wireless communication network (e.g. 4G LTE or 5GNR) for the delivery of services to a number of enhanced CPE (consumer premises equipment), such as fixed wireless apparatus (FWAe). The various FWAe report Channel Quality Indicator (CQI) data to their respective serving base stations over time, and each base station both builds a statistical characterization of each FWAe, and maps the CQI data to a prescribed configuration (e.g., to the Modulation and Coding Scheme (MCS)) adaptively for the transmission of the data to the FWAe, and development of a scheduler priority for each FWAe. In one implementation, once the CQI values are stable for a given FWAe, CQI reporting is terminated for a period of time.