DL-MU-MIMO User Selection via Segmented SINR Calculation
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Solution Overview
Problem
The existing methods for selecting terminals in downlink multi-user multiple input multiple output (DL-MU-MIMO) wireless communication systems face challenges in efficiently calculating the signal-to-interference noise ratio (SINR) due to the increasing number of combination candidates, leading to higher calculation loads and prolonged user selection scheduling times.
Innovation Solution
A method is introduced that simplifies the SINR calculation by defining interference amount information based on execution conditions, allowing for the subtraction of inter-user interference from the signal-to-noise ratio (SNR) to determine the effective SINR, thereby reducing the computational load and speeding up the user selection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If matrix operation is carried out using a channel matrix to calculate SINR for each combination candidate, then the accuracy of SINR calculation is improved, but the calculation amount and processing time increase significantly
Solution Approach 1:
The patent segments the SINR calculation process by separating the channel matrix operations into terminal-specific components. Instead of performing complete matrix operations for each combination candidate, the system pre-calculates and stores terminal-specific channel information, then uses these segmented components to quickly compute SINR values for different combinations without repeating full matrix operations.
Solution Approach 2:
The patent applies preliminary action by pre-calculating channel matrices and terminal-specific interference components before the actual user selection process. These pre-computed values are stored and reused when evaluating different terminal combinations, eliminating the need to perform complete matrix operations from scratch for each candidate combination.
2Reliability
If the number of combination candidates is increased to improve user selection quality, then the transmission quality is improved, but the calculation amount of matrix operation increases
Solution Approach 1:
The patent pre-calculates terminal-specific channel information and interference components before evaluating combination candidates. This preliminary computation allows the system to efficiently assess multiple combination candidates by reusing pre-computed data rather than performing complete matrix operations for each candidate, thus enabling evaluation of more combinations with reduced computational burden.
Solution Approach 2:
The patent uses copying by reusing pre-computed terminal-specific channel information and interference components across different combination evaluations. Instead of recalculating these values for each combination candidate, the system copies and reuses the terminal-specific data, significantly reducing the computational amount while evaluating multiple combinations.
3Reliability
If complete SINR calculation is performed for each combination candidate to ensure accurate MCS selection, then the transmission reliability is improved, but the processing complexity increases
Solution Approach 1:
The patent segments the SINR calculation into terminal-specific components that can be independently computed and stored. This segmentation allows the system to maintain accurate SINR calculations for MCS selection while reducing processing complexity by avoiding repeated complete matrix operations for each combination candidate.
Solution Approach 2:
The patent performs preliminary calculation of terminal-specific channel information and interference components before the combination evaluation process. This preliminary action ensures accurate SINR values for reliable MCS selection while simplifying the subsequent combination evaluation process by reusing these pre-computed values.
Data Source
AI summary
According to one embodiment, a wireless communication device includes: a receiver configured to receive a first frame from a first terminal and a second frame from a second terminal; and controlling circuitry configured to obtain quality information of a first channel with the first terminal based on the first frame and quality information of a second channel with the second terminal based on the second frame, and determine a transmission rate applied to the first terminal and a transmission rate applied to the second terminal in spatially multiplexed transmission, based on the quality information of the first channel, the quality information of the second channel and interference amount information being indicative of an amount of interference depending on an execution condition of the spatially multiplexed transmission.