Radio Base Station Scheduling Using Channel Quality Rank
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Solution Overview
Problem
Conventional scheduling methods in mobile communications systems, such as the PF system, inequitably assign transmission opportunities based on instantaneous and average radio channel quality, leading to less frequent assignments for mobile stations with stable channel quality, despite their high quality.
Innovation Solution
A scheduling method that calculates a rank of radio channel quality for each mobile station within a predetermined observation interval, identifies invalid frequencies where opportunities are not assigned, and assigns transmission opportunities to stations with the smallest difference between their rank and invalid frequency, ensuring equitable distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transmission opportunity is assigned first to a mobile station having a larger amount of change in instantaneous radio channel quality for average radio channel quality (PF system), then the throughput is improved by utilizing the user multiple effect, but a mobile station having small change in radio channel quality is less frequently assigned a transmission opportunity although it has high radio channel quality, thereby unequally assigning a transmission opportunity
Solution Approach 1:
The patent changes the scheduling parameter from instantaneous channel quality to rank-based channel quality. By arranging channel qualities in preferable order within an observation interval and calculating ranks, the system transforms the selection criterion, enabling equitable assignment while maintaining throughput performance.
Solution Approach 2:
The patent performs preliminary arrangement and ranking of channel qualities within an observation interval before making scheduling decisions. This preliminary action allows the system to identify mobile stations with stable high quality that might be overlooked by instantaneous quality-based scheduling.
2Measurement precision
If a transmission opportunity is assigned based on instantaneous radio channel quality and average radio channel quality ratio, then mobile stations with high quality can be identified, but mobile stations with stable channel quality are less frequently assigned opportunities despite having high quality
Solution Approach 1:
The patent introduces a new dimension for quality assessment by ranking channel qualities within an observation interval rather than relying solely on instantaneous quality ratios. This dimensional change allows stable high-quality stations to be recognized and assigned opportunities fairly.
Solution Approach 2:
The system uses feedback from arranged and ranked channel qualities within an observation interval to make scheduling decisions. This feedback mechanism ensures that mobile stations with stable channel quality receive appropriate transmission opportunities based on their consistent performance.
Data Source
AI summary
The present invention provides a radio base station which can equally assign a transmission opportunity based on the radio channel quality. A mobile station selection unit issues a request for a metric notification to a metric notification unit corresponding to a mobile station notified by a data flow control unit, and receives metrics. The metric notification unit periodically receives radio channel quality information from a channel quality notification unit of an uplink signal analysis unit, obtains through a rank calculation unit the rank at the time when the channel quality is preferably arranged in a channel quality buffer according to the radio channel quality information, and notifies the mobile station selection unit of the result as metrics. The mobile station selection unit selects a mobile station having the smallest metrics notified by the metric notification unit, assigns radio resources to the mobile station, and notifies the data flow control unit of the assignment.