Beam Selection Index for CSI Reporting in 5G Wireless Systems
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Solution Overview
Problem
Advanced wireless communication systems face challenges in accurately selecting beams for channel state information (CSI) reporting, particularly in 5G networks with increased antenna ports, which affects the efficiency of wireless data communication between user equipment (UE) and base stations (eNB).
Innovation Solution
The implementation of a method where user equipment (UE) receives configuration information including the number of total and selected beam quantities from a base station, using a predefined mapping table with combinatorial binomial coefficient values to calculate and transmit an index indicating the selected beams, enabling efficient beam selection for CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antenna ports is increased to support 5G networks, then the throughput capacity is improved, but the complexity of beam selection for CSI reporting increases
Solution Approach 1:
The beam selection process is segmented into two stages: first selecting beam groups (coarse granularity) and then selecting specific beams within the chosen groups (fine granularity). This segmentation reduces the overall complexity by breaking down the large search space into manageable subsets, allowing 5G networks to support increased antenna ports while maintaining efficient beam selection for CSI reporting
Solution Approach 2:
The patent extracts and reports only the most relevant beam information (L strongest beams) out of the total N beams, rather than reporting all beam data. This extraction approach reduces the CSI reporting overhead and complexity while preserving the essential channel state information needed for high throughput communication in 5G networks with multiple antenna ports
2Measurement precision
If all beam quantities are reported for CSI feedback, then the channel state information accuracy is improved, but the feedback overhead increases
Solution Approach 1:
The patent extracts only the L strongest beam quantities from the total N beams for CSI reporting. This selective extraction maintains measurement precision by focusing on the most significant beams that contribute most to channel state accuracy, while reducing feedback overhead by excluding less relevant beam information
Solution Approach 2:
Instead of reporting all N beams, the patent applies partial action by reporting only L beams where L < N. This partial reporting is sufficient to maintain accurate channel state information for effective wireless communication while significantly reducing the feedback overhead associated with reporting every beam quantity
Data Source
AI summary
A method of a user equipment (UE) in a wireless communication system is provided, the method comprises receiving, from a base station (BS), configuration information including a number of total beam quantities (N) and a number of selected beam quantities (L), wherein L≤N; calculating an index indicating L selected beam quantities out of N total beam quantities based on the configuration information and a predefined mapping table including combinatorial binomial coefficient values,C(x,y)=(xy)(i.e., x choose y); and transmitting, to the BS, the index indicating the L selected beam quantities.