Rank Selection via Effective Throughput Estimation
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Solution Overview
Problem
Existing wireless communication systems using multiple transmit antenna layers often fail to select the optimal rank for data transmission, leading to suboptimal throughput due to inaccurate estimation of channel quality and block error rates.
Innovation Solution
A method and apparatus for selecting a rank in wireless communications by estimating effective throughput based on block error rates (BLER) for multiple transmit antenna layers, comparing the throughputs of different ranks, and selecting the rank with the highest achievable throughput for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the receiving entity estimates channel quality and converts it to transport block sizes (TBS) for each antenna layer, then a rank can be selected based on sum TBS, but this method does not always lead to optimal rank selection and results in suboptimal throughput
Solution Approach 1:
The patent changes the selection criterion from sum of transport block sizes (TBS) to effective throughput calculated as TBS multiplied by (1-BLER). This parameter transformation incorporates block error rate information directly into the selection metric, allowing the system to account for transmission reliability and achieve optimal rank selection that maximizes actual throughput rather than just estimated block sizes
Solution Approach 2:
The patent introduces feedback mechanisms where the receiving entity monitors block error rates (BLER) for different ranks and uses this feedback information to calculate effective throughput. By continuously monitoring BLER and adjusting rank selection based on effective throughput calculations, the system creates a closed-loop feedback system that adapts to changing channel conditions and achieves more accurate rank selection
Data Source
AI summary
Aspects described herein relate to selecting a rank for wireless communications using multiple transmit antenna layers. A first effective throughput achievable using a first rank and based at least in part on a first block error rate (BLER) associated with the first rank can be estimated along with a second effective throughput achievable using a second rank and based at least in part on a second BLER associated with the second rank. The first rank or second rank is selected to be used for transmitting communications over multiple transmit antenna layers based at least in part on comparing the first effective throughput to the second effective throughput, and the selection can be indicated to a transmitting entity from which the communications over the multiple transmit antenna layers are received.