Wireless Scheduling via Band Segmentation to Reduce Interference
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Solution Overview
Problem
The existing HSDPA system faces challenges in scheduling processes due to increased complexity and interference with the implementation of the E3G system, which requires faster scheduling speeds and more frequent CQI measurements across multiple frequency bands, leading to computational bottlenecks and inefficiencies.
Innovation Solution
A wireless communication system that groups terminals based on their available frequency bands and wireless channel quality, allowing each group to be scheduled independently by multiple schedulers, reducing the computational complexity and interference by measuring and reporting CQI only for active bands, and enabling concurrent scheduling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CQI measurement and reporting is performed across all frequency bands in the E3G system, then scheduling accuracy and resource allocation efficiency are improved, but uplink interference and computational complexity increase significantly
Solution Approach 1:
The patent divides the wide frequency band into multiple sub-bands and performs CQI measurement and reporting only for active sub-bands where data transmission occurs. This segmentation approach reduces the total number of CQI measurements required, thereby decreasing uplink interference while maintaining scheduling accuracy for the active bands. The scheduler processes each sub-band independently, enabling parallel processing and improved scheduling speed.
2Productivity
If CQI measurement and reporting is performed across all frequency bands in the E3G system, then scheduling accuracy and resource allocation efficiency are improved, but computational complexity increases significantly
Solution Approach 1:
The patent segments the frequency band into multiple sub-bands and performs CQI processing independently for each active sub-band. This segmentation reduces the overall computational complexity by breaking down the large-scale matrix operations into smaller, more manageable computations for each sub-band, while still achieving comprehensive resource allocation across the entire bandwidth.
Solution Approach 2:
The patent implements partial CQI measurement by only measuring and reporting CQI for active sub-bands where data transmission is occurring, rather than measuring all frequency bands. This partial action approach reduces computational complexity and signaling overhead while maintaining sufficient scheduling accuracy for the active transmission bands.
3Productivity
If multiple schedulers process terminals independently, then scheduling speed and system throughput are improved, but coordination overhead and resource allocation conflicts increase
Solution Approach 1:
The patent assigns different schedulers to different sub-bands, allowing parallel processing of scheduling decisions for each sub-band. This segmentation eliminates the need for complex coordination between schedulers because each scheduler operates independently on its assigned sub-band, reducing coordination overhead while maintaining high scheduling speed and system throughput.
Data Source
AI summary
A wireless communication system having a base station communicating with a plurality of terminals using a plurality of frequency bands, the wireless communication system includes a controller configured to perform a transmission assignment for each of the plurality of terminals based on a bandwidth in which each terminal is able to communicate; and a communication device configured to enable the base station to communicate with a terminal according to a result of the transmission assignment.