Carrier Aggregation Scheduling for Throughput Fairness
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Solution Overview
Problem
Existing radio communication systems, particularly in LTE-Advanced with carrier aggregation, face challenges in ensuring fairness of throughputs among mobile stations when component carriers have different bandwidths or traffic loads, leading to inadequate allocation of frequency blocks and reduced fairness of allocation opportunities.
Innovation Solution
A frequency block allocation method that determines the number of system bands allocatable to each mobile station, calculates a communication band index based on bandwidths and loads, and uses this index to calculate allocation indices for each mobile station, ensuring fair allocation of frequency blocks across all stations regardless of the number of component carriers they can use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If proportional fairness scheduler is used in carrier aggregation system, then allocation opportunities are improved for mobile stations with more component carriers, but fairness of throughputs deteriorates among mobile stations with different numbers of component carriers
Solution Approach 1:
The patent modifies the allocation index calculation by introducing a communication band index that accounts for the number of allocatable system bands. This parameter change adjusts the scheduling decision to compensate for the disparity in available resources among mobile stations with different numbers of component carriers, thereby restoring throughput fairness while maintaining allocation opportunity efficiency.
2Productivity
If mobile stations with different numbers of component carriers are served, then system capacity is improved, but fairness of allocation opportunities deteriorates
Solution Approach 1:
The patent applies local quality by calculating allocation indices individually for each mobile station based on its specific number of allocatable system bands. This localized adjustment ensures that each mobile station receives fair treatment relative to its capabilities, maintaining system capacity while ensuring fairness in allocation opportunities across diverse mobile station configurations.
3Area of stationary object
If component carriers with different bandwidths are aggregated, then total bandwidth is increased, but fairness of allocated bandwidths deteriorates among mobile stations
Solution Approach 1:
The patent introduces a communication band index that incorporates the number of allocatable system bands as a key parameter. This parameter change enables the scheduler to account for differences in available bandwidth among mobile stations, ensuring that allocation decisions compensate for bandwidth disparities and maintain fairness in allocated bandwidths across mobile stations with different component carrier configurations.
Data Source
AI summary
The application provides a CA scheduling scheme, a base station, a radio communication system and a program to allocate radio resources based on allocation indexes calculated using the bandwidths of component carriers and traffic loads. A frequency block allocation method is for a radio communication system in which a radio station and mobile stations perform radio communication using a frequency block selected from a plurality of system bands. The method comprises an allocation number determination step of determining number of system bands that can allocate to each mobile station; a communication band index calculation step of calculating a communication band index based on bandwidths and loads of the system bands according to the determined allocation number; an allocation index calculation step of calculating an allocation index of the mobile station for each of the system bands using the communication band index and a frequency block allocation step of allocating frequency blocks to the mobile station based on the allocation indices.